Database Develop

Memory Card Benchmarks 2gb v 16gb

All,
Just thought i'd let you know the benchmarks I got from the exisiting 2gb card and a new 16gb card I've bought.
The card I've bought is the new Sandisk Class 4 Ultra micro sdhc which cost me £50 from Amazon.co.uk. I was a bit sceptical at first as the 2gb seemed quite fast so wondered what class it was as it doesn't say and I didn't want the new card to be slower. But I went ahead and bought it anyway as i needed the space.
Both cards are formatted to fat32 with 4096 of allocation
So, CrystalDiskMark benchmarks...
100mb file, 3 passes...
Code:
100mb file Sandisk 2gb Sandisk 16gb
Read Write Read Write
Sequential 10.67 6.639 19.93 16.57
Random Write 512k 10.55 1.261 19.52 2.634
Random Write 4k 2.822 0.010 3.984 0.026
Speeds are in MB/s
Quite a bit faster than I was expecting, so quite happy about this. I know there will be some hardware limitations in the phone so it can only read / write at certain speeds, but for taking pictures, it can save the images quicker and thats a plus for me. Plus the reading of data in music player etc...
Hope it helps some people

nicelad_uk said:
All,
Just thought i'd let you know the benchmarks I got from the exisiting 2gb card and a new 16gb card I've bought.
The card I've bought is the new Sandisk Class 4 Ultra micro sdhc which cost me £50 from Amazon.co.uk. I was a bit sceptical at first as the 2gb seemed quite fast so wondered what class it was as it doesn't say and I didn't want the new card to be slower. But I went ahead and bought it anyway as i needed the space.
Both cards are formatted to fat32 with 4096 of allocation
So, CrystalDiskMark benchmarks...
100mb file, 3 passes...
Code:
100mb file Sandisk 2gb Sandisk 16gb
Read Write Read Write
Sequential 10.67 6.639 19.93 16.57
Random Write 512k 10.55 1.261 19.52 2.634
Random Write 4k 2.822 0.010 3.984 0.026
Speeds are in MB/s
Quite a bit faster than I was expecting, so quite happy about this. I know there will be some hardware limitations in the phone so it can only read / write at certain speeds, but for taking pictures, it can save the images quicker and thats a plus for me. Plus the reading of data in music player etc...
Hope it helps some people
Click to expand...
Click to collapse
quite an impressive hike in write speeds.
I did wonder about the transcend class 6 they have for £55 but then I realised it said 2-3 months expected delivery !
In the end I bought the PNY 16gb card from play for £26 it's supposed to be a class 4 I'll benchmark it when it arrives.

quite impressive
congrats mate for the new card
However, i guess it makes more sense if the larger card volume was a bit slower!
Anywayz, doesnt the bigger card have any negative effect on the battery in terms of consuming more power to mount the storage volume?

Interesting - I have a 16Gb Class 6 on it's way - should be here next week. I'll try and run the benchmarks for it and see if there is much difference.

would be nice if someone could try the class 2 sandisk 16 gb
how did you do the benchmark?

fards said:
quite an impressive hike in write speeds.
I did wonder about the transcend class 6 they have for £55 but then I realised it said 2-3 months expected delivery !
In the end I bought the PNY 16gb card from play for £26 it's supposed to be a class 4 I'll benchmark it when it arrives.
Click to expand...
Click to collapse
PNY card class 4 - where from?

I too have a class 6 16GB card on it's way and I will post my bench's as soon as it gets...

I won't buy a higher one than my 8GB one till a 32GB is released -.-

gavinfabl said:
PNY card class 4 - where from?
Click to expand...
Click to collapse
PLAY..
play.com here > >http://www.play.com/Mobiles/Mobile/4-/11540450/PNY-16GB-Micro-SDHC-Memory-Card/Product.html
the article says class 2, the review says class 4. One of my friends bought one, his is class 4.
Obviously I won't know till mine arrives !
the PNY site isn't much help
http://www.pny.eu/products.php?section=product&categoryid=4&subcategoryid=54&productid=296

Sandisk 8gb class 4 test results (similar to the 16gb class 4)-
Code:
--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
Crystal Dew World : http://crystalmark.info/
--------------------------------------------------
Sequential Read : 20.268 MB/s
Sequential Write : 16.100 MB/s
Random Read 512KB : 19.866 MB/s
Random Write 512KB : 3.009 MB/s
Random Read 4KB : 4.124 MB/s
Random Write 4KB : 0.028 MB/s
Test Size : 100 MB

an idea for you all..... check your local cash converter/pawn shop. i found a lot of micro sdhc card in there.
got my self a samsung 8GB class 6 for 12.00 pounds ! (with 1 year warranty)
they also had a 16gb class 2 for 22 pounds.

Two more cards
I was using the Sandisk USB to MicroSD adapter that ships with Sandisk cards.
I get the feeling that this is limiting the benchmark results
I get
Sandisk 8Gb Class 4
Read Write
SEQ: 19.69 13.19
512k: 19.26 2.337
4k: 3.601 0.021
Kingston 16Gb Class 2
Read Write
SEQ: 19.61 6.729
512k: 19.39 1.091
4k: 3.567 0.024

Sorry guys, but I don't get it. If you buy a card to use it with your Leo these tests are pretty irrelevant. I tested myself several cards, 2GB, 4GB and 16GB, class 2 and 4, both in my PC using ATTO benchmark and in my Leo. I came to the conclusion that a class 2 micro SD card is plenty fast enough when reading/writing with the Leo, so what is the point of spending a little fortune on class 6 cards? The Leo is no high-end DSLR you know...
Using happily a 16GB Sandisk that I purchased in my local PC shop for about 35 Euros. The Leo peaks at 5.2/8.6 MB/s write/read with this card. It did exactly the same with a class 4 4GB Toshiba card and a 2GB class 4 Kingston card. Tested using ATTO Disk Benchmark v. 234 on a core i7 system running Windows 7 64 bit OS.
In my view, the ATTO benchmark is reat because it gives you a speed snapshot at different file sizes, not just the peaks. I wonder what file size is used when manufacturers clasify their cards. Let me tell you, when transfering files smaller that 1 KB, they're all bloody snails, from class 2 to class 12!

atomic_dude said:
Let me tell you, when transfering files smaller that 1 KB, they're all bloody snails, from class 2 to class 12!
Click to expand...
Click to collapse
I hear that, took ages to delete Igo8 off the SD card with all those small files
I prefer the faster cards, say class 4 or even a class 2 if it can perform like this current class 4 because I don't just use it in my phone. I use the card reader and transfer music / videos / pictures etc and with the clip battery cover, it only takes a minute to hot swap.
I know what you mean though, the phone does have limitations which make the cards only work to a certain speed, thats the same in most devices.
All in all though, nice to get some comparisons on here for people who want to know before they buy

16gb card came from play today.
It is class 2, clearly marked as such, so either they are sending out from different sources or something is up.
Either way it's a pretty quick card, I'll benchmark it later on

I was waiting for a 32gb card to be released but that doesn't look like it is going to happen any time soon...
So I am buying a 16gb card. I am going to be using the card in my phone only. Out of these 2 cards which would recommend -
16gb Kingston class 4 or a 16gb Peak class 6 (for a couple of pounds extra)
Part of me wants to go for the class 6 for the speed (but will I really notice it in a phone?) but on the other hand Kingston is a well known brand and I have never heard of Peak.
Thanks

What would you say is the minimum class that i could get a decent experience when playing music/movies and launching apps?

A class 2 card would do the job nicely.

Thanks, will probs get a class 2 16GB one

fards said:
16gb card came from play today.
It is class 2, clearly marked as such, so either they are sending out from different sources or something is up.
Either way it's a pretty quick card, I'll benchmark it later on
Click to expand...
Click to collapse
Took your advice and bought the 16gb one you recommended from play too in the hope it was Class4. No idea what Class it actually is but its definately quicker than the previous 2Gb, and 8Gb cards I had in it! - I can tell cus when I wizz through the photos in landscape mode they appear almost instantly whereas the other cards took time to load them up. or maybe thats cus of this new ROM - I'm not sure.....hmmm....

List of SD Cards that don't work for Nookie Froyo

Please post in this thread if you have a SD card that has not worked for you with Nookie Froyo. Please post the brand, capacity, class, and version of Froyo you are using. I will keep an updated list in this post:
Known Good
16GB Class 4 Patriot - 5.9, 6.6, 6.7
8GB Class 6 Lexar - 6.6, 6.7
8GB Class 6 Wintec - 5.9 (untested 6.6 and 6.7)
4GB Class 2 MicroCenter brand - 5.9, 6.6, 6.7
4GB Class 6 Transcend - 5.9, 6.6, 6.7
4GB Class 6 Adata - 5.9 (untested 6.6 and 6.7)
2GB Class 4 Sandisk - 6.6, 6.7
Known Bad:
16GB Class 6 RiData - hangs on Android boot screen with 5.9, with 6.6 and 6.7 it boots but gets endless loops of force closes. Tried multiple cards, all brand new.
16GB Class 10 Patriot - same symptoms as above
16GB Class 10 Wintec - same symptoms as above
16GB Class 6 Transcend - same symptoms as above
16GB Class 10 Adata - same symptoms as above
Questionable:
16GB Class 4 Sandisk

Known good:
Lexar 8GB class 6 - 6.6, 6.7
Sandisk 2GB Class 4 - 6.6, 6.7
no experience with any problematic MiscroSD's yet...

Sandisk 16GB class 4, I assume same problem as all other 16 GB cards.

MXIIA said:
Sandisk 16GB class 4, I assume same problem as all other 16 GB cards.
Click to expand...
Click to collapse
Are you saying this doesn't work? It's working fine for me. Make sure you don't have a counterfeit. Apparently if the black serial numbers are not printed card it's a fake.
I can add that I didn't have any luck with the Patriot or Wintec 16GB cards.
8GB Lexar C6 does work.
My theory is the card needs to have good random write performance 512k and 4k. If 512K is 2Mbps or better seems to work. This was tested using crystaldisk mark using a USB 2.0 adapter.
Also note, performance of a particular card isn't exactly easy to determine. If I use different devices to adapt a card to the PC I get different speed results. For example on the same card, I got .5 Mbps 512k random speed using a Dell E6410 adapter, but 1Mbps using a usb microsd adapter.
Mike
Mike

I have a class 10 16g ADATA. I ran into the endless loop fc problem for 0.6.7. I formatted the card from nook stock rom then ease it from my MacBook pro by using disk utility. The endless loop fc problem went away afterward. I am still having problem with the honeycomb v4. It gave me a "enter password to decrypt the storage" screen after it boots up. No idea why it is that. Kinda frustrated ....
Sent from my PC36100 using XDA App

Speaking of counterfeit SD cards, this isa HUGE problem on ebay. Always purchase from a trusted source.
If you suspect issues with your card, H2TESTW is considered one of the better testing and benchmarking tools. Very small, very simple:
H2testw 1.4 – Gold Standard In Detecting USB Counterfeit Drives

Sorry to resurrect a month-long post, but I wanted to add my experience since I'm seeing some really unusual behavior.
16 GB Class 10 Patriot w/ Nookie Froyo development 0.6.8 - worked
16 GB Class 10 Patriot w/ Nookie Honeycomb v04 - booted but always asked for password
Here's where it gets weird:
16 GB Class 2 Samsung OEM (came with my phone) w/ Nookie Honeycomb v04
The first boot immediately after burning the img to the card will work. I boot into Honeycomb, I can play with all the features and apps, change settings, etc. It seems to work fine.
If I shut down and boot it again, it will hang at the Android boot screen. The only way I can get it to work again is to re-burn the img to the card again.
BTW, the CrystalDiskMark scores to the best of my recollection:
16 GB Class 10 Patriot
seq: 19 MB/s read, 15 MB/s write
512k: ~8 MB/s read, 0.7 MB/s write
4k: ~3 MB/s read, 0.006 MB/s write
16 GB "Class 2" Samsung
seq: 15 MB/s read, 11 MB/s write
512k: ~5 MB/s read, 0.6 MB/s write
4k: ~2 MB/s read, 0.012 MB/s write
Apparently Samsung is very conservative in the class rating they give their memory.

I've got a 16GB Sandisk microSDHC card with adaptor. It says '4' on the card's sticker, so I'm assuming it's a class 4. Does this mean my card won't work?
Also, I'm using it in my Samsung Galaxy right now. Can I just transfer the files to my PC and format the card, before using it for rooting the NC?
TIA.

Kingston 8Gb class 4 nf6.8 - boot but has problem with market.
Took me hrs to realize it was the card.
I am using patriot class 10 8GB
Works great. No problem so far. As fast as emmc 1.1 root.

wish i wouldve looked for this kind of thread sooner. bought the 16gb patriot class 10. doesnt work returning it for another class 10 8 gb

16GB Class 4 Sandisk
No problems so far 0.6.8

anyone have any review on KingMax 16GB micro SDHC class 10?
thanks

Since I plan to have videos I really want to get as much storage on a single card as possible. I DO plan to boot 2.2 (until 3.0 is ready for primetime) from eMMC, but I want to be sure it will be compatible.
REEDIT: Yeah it does support 32gb.
Anyone tried any 32GB cards?

4G class4 Toshiba worked for me

I've also tried the class 10 WinTec 16GB uSD. I can get Nookie FroYo to boot but I'm unable to installl apps from the market and most of the preloaded apps will hang at launch. I've tried multiple downloads from multiple sources and they've had the same results. The sdcard works fine with my laptop and camera, fwiw.
Sent from my NookColor using XDA App

(Note: All testing done with CM7-RC4)
Patriot 4GB Class 10 - Installs and will boot, but MASSIVE lag/stuttering, erratic behaviour, slow download speeds from Market (2-4KB/s, bursting to 200KB/s now and then). Definitely seems like a problem with class 10 cards.
SanDisk 8GB Class 4 - Works perfectly; hard to tell it's running from MicroSD and not internal memory aside from a slightly slower boot (maybe 15 seconds more).
Dane-Elec 4GB Class 4 - Works just as well as the SanDisk from limited testing. Took a little longer to cache everything up after the first boot, but worked with minimal initial hesitation after the next few boots.

SD Strange-results - or - How I learned to love CM7 on SD - Dec-11 results compiled!

1/16/2012 update: Thanks to waxhell for compiling all of the results in this thread (at least as of mid-december! OK, so I took a while to get this posted...)
https://docs.google.com/spreadsheet/ccc?key=0AjPE3ZAD2eVudE9vZmQ3aHlfTkFvU2J4ZUplRDJQTEE
5/20 update: SD card performance benchmark table by a.fenderson from later in this thread added at the bottom of this post. Thank you a.fenderson!
------------------
April minor update with a Transcend SD (see http://forum.xda-developers.com/showpost.php?p=12964262&postcount=8)
_________________________________________________
Let me tell you my story.
Over the last couple of months as I have mucked around with SD booting various flavors of froyo and, more recently, CM7, I have found it maddening that there are apparently so many people that LOVE those versions, even people that seemed to have the same SD card as the two I've tried.
One of those is a Class 10 Patriot 8gig, which I've seen mentioned as an acceptable boot disk.
The other is a Kingston Class 4 4gig that tests out as significantly slower than the Patriot, but didn't really run froyo any slower.
Now I know I've seen posts that mention small block write speed as being important, but the numbers I've seen posted really didn't make me think the Patriot was the cause...
...the cause of FRUSTRATINGLY slow UI, where froyo (and CM7) seem to go off into lala-land for a few seconds every time I (tried to) do something.
...the cause of glacial web-surfing, where even downloading GOOGLEforchrissake takes forever. Of snail's-pace market downloads. Oh god.
Every time I would give up and go back to Eclair and breath a sigh of relief, reveling in the snappiness, the zippy web-surfing, the rapid response of m.pornhub.com.
And every time the siren song of the CM7-elite would call me back. THIS time I did something different. I saw mention that a Class 2, YES A FREAKING CLASS 2, Sandisk from costco worked well. So I skippity-skopped up and bought one.
After backing up the Patriot and writing THAT VERY SAME img to the Sandisk (which, yes, took 3 times as long as writing to the Patriot), I booted CM7.
OMG
The heavens opened and the angels sang, I HAD ARRIVED IN THE PROMISED LAND!
NOW I knew what the chosen had been praising! NOW I knew the joy that is CM7! ZIP-ZIP-ZIPPITY!
HOLY CRAP?! How could a benchmark be so misleading? I HATE those bastard SD manufacturers, or maybe it's the industry group that chose such a sucky measure of speed.
For your edification, here are some CrystalDiskMark (5 iterations, 50MB) results from 2 sucky cards and the good Sandisk.
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIFTY times the speed of the Patriot and ONE HUNDREDtimes the Kingston.
Now you may say, "Swizzlenuts, old pal, I KNEW that."
But for all you poor slobs who didn't, who are dragging yer sorry ass through the broken glass that is booting off of a slow SD (you know who both of you are), I hope this helps.
And now you may commence posting links to specific posts where this info was discussed in detail last December.
------------------
Thanks to all of the people that posted their results and to a.fenderson for compiling them. Here's his table from http://forum.xda-developers.com/showpost.php?p=13991898&postcount=144
Code:
POSTER BRAND CLASS CAPACITY 4 KB RANDOM
(GB) WRITE QD32(MB/s) NOTE
swoozle SanDisk 2 8 1.791 Model: SDSQ-8192-AC11M
a.fenderson SanDisk 4 16 1.660 SanDisk C4 16GB 1 of 2 cards
MickMcGeough SanDisk 4 8 1.59 benchmarked in XBench, QD unknown
a.fenderson SanDisk 4 16 1.500 SanDisk C4 16GB 2 of 2 cards
Awats SanDisk 4 16 1.391 SanDisk C4 16GB 1 of 2 cards ; fastest (onboard) reader
arwild01 SanDisk 4 8 1.369
Awats SanDisk 4 16 1.284 SanDisk C4 16GB 2 of 2 cards ; fastest (onboard) reader
robot8 SanDisk 4 8 1.270 SanDisk C4 8GB 2 of 2 cards
robot8 SanDisk 4 8 1.259 SanDisk C4 8GB 1 of 2 cards
chinly43 SanDisk 4 16 1.257 (not via Nook) ; same card as chinly43's other listed SanDisk C4 16GB
joobu SanDisk 4 4 1.175
angomy Nook internal N/A N/A 1.116 via Nook on USB
chinly43 Nook internal N/A N/A 1.094 via Nook on USB
a.fenderson Transcend 2 32 1.032
a.fenderson SanDisk 4 4 0.898
a.fenderson SanDisk 2 4 0.891
pchoi94 SanDisk 4 16 0.834
chinly43 SanDisk 4 16 0.769 via Nook on USB ; same as chinly43's other listed SanDisk C4 16GB
pryonix SanDisk 4 8 0.625
chinly43 SanDisk 2 8 0.616
a.fenderson SanDisk 4 8 0.596
angomy SanDisk 4 16 0.574
Blue6IX SanDisk 2 16 0.350
a.fenderson SanDisk N/A 2 0.269
Awats SanDisk 4 2 0.261 SanDisk C4 2GB 1 of 2 cards ; fastest (onboard) reader
Awats SanDisk 4 2 0.236 SanDisk C4 2GB 2 of 2 cards ; fastest (onboard) reader
pryonix Samsung N/a 2 0.093
victle Kingston N/A 2 0.051
victle Dane-Elec N/A 2 0.050 0.050 or less: exact value unspecified
joobu Lexar 4 8 0.038
swoozle Patriot 10 8 0.038
Blue6IX Dane-Elec 4 4 0.037 (made in Japan)
omghahalol Transcend 6 16 0.037
Ravynmagi Samsung(??) 2 4 0.037
pryonix Kingmax 10 16 0.036
Ravynmagi Wintech 10 16 0.036
victle Transcend 6 4 0.034
omghahalol Transcend 6 8 0.033
Ravynmagi SanDisk 2 8 0.033
pryonix Transcend 6 8 0.033
Ravynmagi Patriot 10 16 0.030
Blue6IX PNY 10 8 0.030
pchoi94 Kingston 2 16 0.030
swoozle Transcend 6 8 0.029 Model: TS8GUSDHC6
joobu ?? N/A 2 0.029
chinly43 SanDisk N/A 1 0.029
a.fenderson SanDisk N/A 1 0.028
victle PNY 4 8 0.028
Blue6IX PNY N/A 2 0.027 (made in Taiwan)
omghahalol SanDisk 2 2 0.021
MickMcGeough SanDisk 2 8 0.02 benchmarked in XBench, QD unknown
robot8 Transcend 6 8 0.018 Transcend C6 8GB 1 of 2 cards
ExploreMN Patriot 10 16 0.018
arwild01 Samsung(??) 4 8 0.017
swoozle Kingston 4 4 0.016 Model: SDC4/8GB
Awats Patriot 4 4 0.016 Patriot C4 4GB 1 of 2 cards ; fastest (onboard) reader
robot8 Transcend 6 8 0.014 Transcend C6 8GB 2 of 2 cards
Tnexus Patriot 10 16 0.014
a.fenderson Kingston 4 8 0.014
Awats Patriot 4 4 0.011 Patriot C4 4GB 2 of 2 cards ; fastest (onboard) reader
chinly43 Lexar 4 8 0.011

I love the kubrik reference in title.
so my cheapy microcenter 4gb is why my HC preview was just "okay"

Both entertaining and edifying.
Thanks, swoozle! (I mean "swizzlenuts" old pal?)
Now if only that obscure performance metric were easily determined from printed SD card specifications...

Yeah, I have two old 2G uSD (no classified) and both work fine with CM7. The benchmarks are almost as good as the well tested Transcend 4GB class 6, random write speed beat the Transcend, but random read is little bit slower

My Kingmax card works butter smooth with CM7......but always hangs up on nookie froyo....
So, I am gonna buy sandisk now

I experienced the same thing
All my so call fast cards (class 6 and class 10) worked very slow or had boot problems. After switching the to the Costco Sandisk class 4 card, I was able to use CM7, HD, and all the other images with good preformance from the SD card.
swoozle said:
Let me tell you my story.
Over the last couple of months as I have mucked around with SD booting various flavors of froyo and, more recently, CM7, I have found it maddening that there are apparently so many people that LOVE those versions, even people that seemed to have the same SD card as the two I've tried.
One of those is a Class 10 Patriot 8gig, which I've seen mentioned as an acceptable boot disk.
The other is a Kingston Class 4 4gig that tests out as significantly slower than the Patriot, but didn't really run froyo any slower.
Now I know I've seen posts that mention small block write speed as being important, but the numbers I've seen posted really didn't make me think the Patriot was the cause...
...the cause of FRUSTRATINGLY slow UI, where froyo (and CM7) seem to go off into lala-land for a few seconds every time I (tried to) do something.
...the cause of glacial web-surfing, where even downloading GOOGLEforchrissake takes forever. Of snail's-pace market downloads. Oh god.
Every time I would give up and go back to Eclair and breath a sigh of relief, reveling in the snappiness, the zippy web-surfing, the rapid response of m.pornhub.com.
And every time the siren song of the CM7-elite would call me back. THIS time I did something different. I saw mention that a Class 2, YES A FREAKING CLASS 2, Sandisk from costco worked well. So I skippity-skopped up and bought one.
After backing up the Patriot and writing THAT VERY SAME img to the Sandisk (which, yes, took 3 times as long as writing to the Patriot), I booted CM7.
O
M
G
The heavens opened and the angels sang, I HAD ARRIVED IN THE PROMISED LAND!
NOW I knew what the chosen had been praising! NOW I knew the joy that is CM7! ZIP-ZIP-ZIPPITY!
HOLY CRAP?! How could a benchmark be so misleading? I HATE those bastard SD manufacturers, or maybe it's the industry group that chose such a sucky measure of speed.
For your edification, here are some CrystalDiskMark results from 2 sucky cards and the good Sandisk.
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIVE times the speed of the Patriot and TEN times the Kingston.
Now you may say, "Swizzlenuts, old pal, I KNEW that."
But for all you poor slobs who didn't, who are dragging yer sorry ass through the broken glass that is booting off of a slow SD (you know who both of you are), I hope this helps.
And now you may commence posting links to specific posts where this info was discussed in detail last December.
Click to expand...
Click to collapse

I have a Transcend 8gb class 6 and Kinkmax 8gb class 6 none work well. The Transcend is by far the better of the two. I have now ordered a 16GB Sandisk class 2 to see how that works.

Update:Transcend
Just a minor addition with a Transcend card. I'd seen many posts that swore by a Transcend Cl 6 8G card through Newegg. I ordered, received, benchmarked and loaded CM7 Nightly 37.
To cut to the chase, the Transcend sucked big hairy monkey balls. Similar small block write speeds as the other crappy cards. And the CM7 performance was predictably bad. Crappy UI response and FCs.
__Test_________Sandisk Cl2 8G___Patriot CL10 8G____Kingston Cl4 4Gig___Transcend Cl6 8G
Sequential Read___10.871 MB/s____20.036 MB/s___________18.700 MB/s___________19.930 MB/s
Sequential Write___6.659 MB/s____13.660 MB/s____________4.277 MB/s___________19.325 MB/s
Rndm Rd 4KB(QD32)__3.077 MB/s_____3.444 MB/s____________2.088 MB/s___________2.968 MB/s
Rndm Wrt 4KB(QD32)_1.791 MB/s_____0.038 MB/s____________0.016 MB/s___________0.029 MB/s
I'm sure any of these would work fine as data cards. But for running off of SD, it makes a huge difference.

Have to agree. Have 3 8gb microSD cards including a Patriot and a Kingston but the only one that reliably runs CM7 is the cheapo SanDisk

+1.
My PNY card was too slow and it took forever to download apps from market (CM7) and I replaced it with a old 8G class 2 sandisk.. Man.. no need to say it..
BTW, anyone why does sandisk makes class 6 or class 10 micro SD card? I did find the extreme III of SD card only... and not the micro card.

swoozle said:
Just a minor addition with a Transcend card. I'd seen many posts that swore by a Transcend Cl 6 8G card through Newegg. I ordered, received, benchmarked and loaded CM7 Nightly 37.
To cut to the chase, the Transcend sucked big hairy monkey balls. Similar small block write speeds as the other crappy cards. And the CM7 performance was predictably bad. Crappy UI response and FCs.
...
I'm sure any of these would work fine as data cards. But for running off of SD, it makes a huge difference.
Click to expand...
Click to collapse
I have been running off a Transcend CL6 8G card and while my install felt zippy and pretty smooth, I have been having some FC issues and random quirkiness. I believe you have smacked the nail on the head here in that what really matters is the speed of the small block random writes. Having ruled out all other possibilities, it is the only thing that may explain why I am having intermittent artifacts in my streaming video.
Thank you for posting your tests and results, gonna go grab an el cheapo Cl2 card asap.
edit: So I picked up a cheap Class 2 Sandisk 8G card and it's been rock solid on the latest nightly 41 with 4.18C test kernel.

From my experience using CM7 on different high-speed uSD cards (Kingston, Patriot and Transcend), the results between brands and within brands are inconclusive and inconsistent. I'm beginning to think it has more to do with the individual card, i.e., the luck of the draw (or lack thereof). With such hit-or-miss results, perhaps the best approach is to keep trying until you find a good one.

I'm having a similar oddity... I have CM7 installed to eMMC, and on an 8GB Class 4 SanDisk MicroSD. The microSD actually boots /faster/, and has less UI lag than the internal memory!
Wondering if I messed up the flash (redid it a few times with no real change), install process, or if the internal memory is actually slower than the microSD somehow. Kind of backward thinking to my mind, but hey...

I think SD card variability isn't sufficiently highlighted in instructions for running off the SD card. I had issues with a Transcend class 6 4 GB card but no issues with an unclassified 2 GB.
If this issue is highlighted I think it might avoid a lot of frustration.

I'm seeing similar results with my cards on Random Write 4KB(QD32):
Sandisk Class 4 4GB:_________1.175 MB/s
Random unclassified 2GB:_____0.029 MB/s
Lexar Class 4 8GB:___________0.038 MB/s

swoozle said:
__Test_________________Sandisk 8G Class 2___Patriot 8G Class 10____Kingston Class4 4Gig
Sequential Read :__________10.871 MB/s________20.036 MB/s___________18.700 MB/s
Sequential Write :__________6.659 MB/s________13.660 MB/s____________4.277 MB/s
Random Read 4KB (QD=32) :___3.077 MB/s_________3.444 MB/s____________2.088 MB/s
Random Write 4KB (QD=32) :__1.791 MB/s________0.038 MB/s_____________0.016 MB/s
Look at that, both the Kingston and the Patriot blow away or are close enough to the Sandisk in everything BUT....
(wait for it)....
SMALL BLOCK RANDOM WRITES
where the Sandisk is FIVE times the speed of the Patriot and TEN times the Kingston.
Click to expand...
Click to collapse
I have only ever seen the sequential speeds quoted in specs. In fact, if the SanDisk was only 10x faster then the Kingston would need to be .16 and not .016 right? So isn't the sandisk actually 50x and 100x faster?
How can we find card with decent random r/w performance though, does anyone spec for that?

Woops, you are correct. Missed a zero, thanks.
No, I've never seen such a spec quoted either. I imagine it's because any normal use of an SD card doesn't depend on random write speed so much.

Hm, here I had given up running anything from an SD since I failed to even boot up either Froyo or CM7 with mine. But I have a 16gb Sandisk class 2 in my other phone! Going to try that then.
Noobquestion, how do you back up an android SD-card? Can I just copy paste the entire card to my pc hard drive, and then transfer it back when I want to use it in my phone again? Or do I have to use some kind of backup program?

The results are not strange. Card class only reflects sequential speed, but random speed is more important for OS operation. For example, ReadyBoost certified Flash drives have to have certain minimum random access speed.
Similar issue was brought up when people tried to replace SD cards in WP7 phones:
the big issue is random access performance -- a figure that isn't taken into account in a card's class rating. Ironically, Microsoft discovered in its testing that cards with higher class ratings actually performed worse on Windows Phone 7 because the tweaks card manufacturers make to achieve high sequential throughput can actually hurt random access times.
http://www.engadget.com/2010/11/17/windows-phone-7s-microsd-mess-the-full-story-and-how-nokia-ca/
It's good to know that Sandisk cards generally have good random access speed. However, it's not guarantied. They may choose cheaper NAND any time in future.
Added: For guarantied result one may try to find ReadyBoost certified microSD, but I don't know if they exist, probably they certified only USB sticks.
Or, WP7-certified microSD cards just recently started to appear.
http://www.engadget.com/2011/04/15/windows-phone-7-certified-microsd-cards-emerge-at-atandt-stores/
Right now it's probably the same Sandisk card, just repackaged and priced higher. If I were to buy microSD to run OS from I would choose Sandisk and would hope that I'm lucky.
But WP7-certified cards could be a good choice if regular Sandisk cards suddenly become worse or if you just want to be sure, they should have good random access speed.

This is surprising to read. I've looked pretty much everywhere and the consensus has seemed to be that the Transcend 8GB, class 6 cards were top notch. Just ordered one off of Amazon too. Maybe I should just grab a Sandisk instead.

UHS-1 MicroSD

Dear readers,
I'm searching a for a new SD card for my HD2 for a while now and wanted to buy a 32gb class 10 microsd card from samsung.
But then i saw a new cards with new classes called "UHS".
I also saw one of them having the class 6 and the UHS class.
I have a few question regarding this:
1. Does this UHS class work on the HD2?
2. Is it possible for a card to have a normal class and a UHS class?
3. if not, are UHS 1 cards as fast as class 10 cards on devices that do not support UHS?
4. How can UHS 1 be cheaper then class 10?
adata 32gb micrsosd UHS 1: cant post url...
the same card for 22 euro's: cant post url...
samsung 32gb microsd class 10 for 26 euro's: cant post url...
I hope this topic will answer the the questions i think other people have too.
kind regards,
4rjan

Can't answer for sure if they are 100% compatible with HD2 hardware(there is certain hardware requirement for UHS), but in theory any speed after class 8/10 is pointless. Class 10 is close to HD2 hardware bandwith limit. You won't benefit that.

Nobody??

I was also looking for a 32GB class 10 card and found the UHS-i type, but in the reviews i saw said about compatibility issues in non compatible devices or transfer speeds relatively low in devices without UHS-i compatibility.
To avoid problems i purchased one Samsung Class 10 card, works perfectly in my HD2 and don't have to worry.

That is exactly what i thought, that the uhs-i has a lack of performance on not supported uhs-i devices and that they are not completely backwards compatible to normal class 10 speed.
Do you maybe have a URL of those complaints?

hardan said:
I was also looking for a 32GB class 10 card and found the UHS-i type, but in the reviews i saw said about compatibility issues in non compatible devices or transfer speeds relatively low in devices without UHS-i compatibility.
To avoid problems i purchased one Samsung Class 10 card, works perfectly in my HD2 and don't have to worry.
Click to expand...
Click to collapse
That would be expected for transferring relatively small files and using windows formatting as the random read/write speed (most frequently used) will be slower with a higher class, whereas the sequential read/write speed will increase. This may beneficial for users with WP7 but if you use it anywhere else it will seem much slower.
Sent from my T9193 using xda

But do UHS class 1 cards run ass class 10 cards when they are used with non supported UHS devices? If it is true what you guys are saying then its not.
I can't find anything about it on the English Wikipedia, but on the dutch Wikipedia it says it runs like class 10 on non supported devices:
http://nl.wikipedia.org/wiki/SD-kaart
UHS: MB (Megabyte) Mb (Megabit)
UHS Class 1 10 MB/s (min) 80 Mb/s (min)
UHS-I 104 MB/s (max) 832 Mb/s (max)
UHS Class 2 105 MB/s (min) 840 Mb/s (min)
UHS-II 300 MB/s (max) 2400 Mb/s (max)

Home » Frequently Asked Questions » Memory Card
WHAT IS UHS-1 ?
"UHS-1" or more accurately "UHS-I" stands for "Ultra High Speed" - 1 and is a speed class for SDHC and SXDC memory cards.
UHS-I is the fastest category of card available today with a bus interface speed of up to 104 MB/s.
An SDHC UHS-I card will work in any SDHC compatible device at lower speeds, but to take advantage of the UHS-I speed, a UHS-I compatible device is essential.

omidz said:
An SDHC UHS-I card will work in any SDHC compatible device at lower speeds, but to take advantage of the UHS-I speed, a UHS-I compatible device is essential.
Click to expand...
Click to collapse
the question is what are those "lower" speeds?

4rjan said:
the question is what are those "lower" speeds?
Click to expand...
Click to collapse
The speeds would be the Class 6 or Class 10 speeds, depending on what's listed on the card. Of course, even that can be bottlenecked by your device's cache.

UHS-I doesn't work nice!
I try to use a SanDisk 16GB class10 Ultra MicroSd HC-I but as I found out it doesn't feet with my HD2 EU..... ...Although it works very smooth and fast after some hour my phone just freezes....only the light of the hardbuttons works...screen turns black...I take off the battery...and all this sadness comes to my face...
So I got back to my Transcend 16GB class10 and everything works almost fine (a little bit slow sometimes, so I use sd card boost and swapper2).
You can see by yourself ...the mmc driver has not included UHS mode...

UHS vs CLASS
The UHS means it has content transfer speed of minimum 30mbps to maximum of 104mbpswhen you transfer the content from MicroSD to System(PC)....but the data write speed on the MicroSD depends on the CLASS mentioned on it i.e., CLASS 10 has MAX write speed of 10MB/S......(Note: all this speed transfer test will use top speculated system configurations so it may vary on our PC's).

Hello,
Just to echo what a few people have said elsewhere and clarify something. Using an SDcard with a UHS classification may well cause your HD2 to hang, black screen, freeze, crash .... especially when using certain ROMs. Some seem more resilient than others, but the NativeSD ROMs in particular rely heavily on accessing the SDcard. The only way to reset after a blackscreen is to remove battery and reboot.
The HD2 was never designed to work with these cards and they require specific voltages from the phone hardware in order to run correctly. The HD2 does not have such hardware. I used a Sandisc 16GB Class-10 UHS-1 card and my phone would hang/crash 7-10 times each day. After replacing it with a Class-10 Kingston card with no UHS classification, the phone runs fine. Nothing else was changed except the SDcard. The exact same installation was used by cloning the SDcard partitions. Consequently the phone runs fine now.
Just thought I'd post up in case it helps others.
Would appreciate if someone could mirror this post for me (I have less than 10 posts on XDA and don't want to spam the forum just to get them) on this thread for [ROM][4.1.2][720p] NexusHD2-JellyBean-CM10 V1.5 [NativeSD] because a few people were complaining of bugs and it's nothing to do with the ROM itself, more the memory cards they are using.

doctorasgr said:
I try to use a SanDisk 16GB class10 Ultra MicroSd HC-I but as I found out it doesn't feet with my HD2 EU..... ...Although it works very smooth and fast after some hour my phone just freezes....only the light of the hardbuttons works...screen turns black...I take off the battery...and all this sadness comes to my face...
So I got back to my Transcend 16GB class10 and everything works almost fine (a little bit slow sometimes, so I use sd card boost and swapper2).
You can see by yourself ...the mmc driver has not included UHS mode...
Click to expand...
Click to collapse
Use 32GB Sandisk class10 Ultra UHS HC-I without a single issue. Did want the mobile Ultra class 6 to be safe but sent me class10 UHS but worked out fine ...

Mister B said:
Use 32GB Sandisk class10 Ultra UHS HC-I without a single issue. Did want the mobile Ultra class 6 to be safe but sent me class10 UHS but worked out fine ...
Click to expand...
Click to collapse
:thumbup:
Enviado desde mi GT-I9300 usando Tapatalk 4 Beta

Very strange,i using a Sony 8GB UHS-1 and it works fine with all roms (dataonext,nativesd).I'm thinking to buying a Sony 16GB UHS-1

I am using SanDisk ultra 16Gb UHS-1 card without any issue for some time now with many different ROMs. I would rather bet that not original (Kingston, Sony, no names) that looks like original cause that.

guys what do you think about this card http://youtu.be/PuHfmuJ8pf0.... I am about to buy a new 32gb card for my new phone.
please give suggestions....

recommended sd card

So I've searched for optimal SD card for xz1 but only references I get are to Z1 and other, older models.
Is it a waste of money to buy UHS-II cards? Where are the xz1c fastest write/read speeds so I only buy the card that matches those performance metrics?
Thank you!

I can't find any specific details, but Sony literature for other devices, including the Premium only goes up to UHS-I, so yes, I think it's probably a waste. The maximum speed may be defined by the SoC. I went for a Samsung Evo Plus UHS-3 as it was the same price as the UHS-1 Sandisks and claims some blistering numbers, so figured it was on the safe side of being fast enough and at the same time didn't break the bank at £22.30.

I don't own the phone yet, but for 4K you should use UHS 3 should use UHS-I U3 to guarantee a stable write speed.
As Dashers, I own the Samung EVO+ for my action cameras and they never let me down. Would stick them into the phone too.
[edit]
fixed my error mismatching UHS-3 and U3

shaftenberg said:
I don't own the phone yet, but for 4K you should use UHS 3 to guarantee a stable write speed.
As Dashers, I own the Samung EVO+ for my action cameras and they never let me down. Would stick them into the phone too.
Click to expand...
Click to collapse
If the phone's chipset doesn't support UHS 3, there's no use in getting one of these from the speed standpoint.
EDIT: According to the Qualcomm webpage, the used chipset supports UHS-I.
Source: https://www.qualcomm.com/products/snapdragon/processors/835

4rz0 said:
If the phone's chipset doesn't support UHS 3, there's no use in getting one of these from the speed standpoint.
Click to expand...
Click to collapse
You are right, I mismatched U3 = UHS 3, which isn't.
UHS 1 = U1 or U3
https://www.sdcard.org/consumers/choices/speed_class/index.html
So, for 4K U3 is clearly recommended:
UHS-I U1 indicates that the card is fast enough to shoot Full HD 1080p. (> 10 MB/s constant write)
UHS-I U3 means that the card can support shooting 4K Ultra HD videos with UHS-I enabled devices (> 30 MB/s constant write)
Click to expand...
Click to collapse
https://www.techfunology.com/electr...-cards/the-best-hcsd-cards-of-2014-our-top-10
[edit]
I benchmarked two cards in my Z3 Compact, which is 4K capable, so I think the XZ1 won't be slower
Sandisk Ultra, 64GB, Class 10 (which is same as U1):
READ: 42,18 MB/s
WRITE: 16,88 MB/s
Samsung EVO+, 256GB, U3
READ: 41,94 MB/s
WRITE: 28.86 MB/s
Sure it depends on the framerate and the bitrate of the video, but to be on the safe side, I'd always take the U3 over the U1 if I want a constant write speed. Same with transferring gigabytes from the card to the PC, U3 is much faster. (>100 MB/s read speed with my Kingston card reader)

shaftenberg said:
You are right, I mismatched U3 = UHS 3, which isn't.
UHS 1 = U1 or U3
https://www.sdcard.org/consumers/choices/speed_class/index.html
So, for 4K U3 is clearly recommended:
https://www.techfunology.com/electr...-cards/the-best-hcsd-cards-of-2014-our-top-10
[edit]
I benchmarked two cards in my Z3 Compact, which is 4K capable, so I think the XZ1 won't be slower
Sandisk Ultra, 64GB, Class 10 (which is same as U1):
READ: 42,18 MB/s
WRITE: 16,88 MB/s
Samsung EVO+, 256GB, U3
READ: 41,94 MB/s
WRITE: 28.86 MB/s
Sure it depends on the framerate and the bitrate of the video, but to be on the safe side, I'd always take the U3 over the U1 if I want a constant write speed. Same with transferring gigabytes from the card to the PC, U3 is much faster. (>100 MB/s read speed with my Kingston card reader)
Click to expand...
Click to collapse
Thanks for the research!
May I ask, how did you benchmark the cards inside the phone?

4rz0 said:
Thanks for the research!
May I ask, how did you benchmark the cards inside the phone?
Click to expand...
Click to collapse
You're welcome.
Sure, here:
https://play.google.com/store/apps/details?id=com.a1dev.sdbench