Database Develop

microSD Card classes

Hi guys. I was wondering if there are any issues making bootable SD cards for honeycomb or froyo and etc.
I am thinking of buying an micro sd card for the nook color.
which one of you guys would recommend?
16GB class10? 8GB class10?
I have seen all mostly using 8gb or 4gb at most. is there any issue using 16gb class10? please advice. thanks!

should be fine.

waiteck said:
Hi guys. I was wondering if there are any issues making bootable SD cards for honeycomb or froyo and etc.
I am thinking of buying an micro sd card for the nook color.
which one of you guys would recommend?
16GB class10? 8GB class10?
I have seen all mostly using 8gb or 4gb at most. is there any issue using 16gb class10? please advice. thanks!
Click to expand...
Click to collapse
If they are same class then you should get about the same speed off either and all your looking at is size... if you want 8gb of space get the 8gb if you want 16gb of space get that one instead.....
I would not recommend using anything lower than a Class 6 card however.

I've run HC on a 8gb class 4 card for a while. No real problems. Maybe lags a little time to time, but that may also just be the rom.

i see... initially i thought there were issues with class10 16gb cards.
thanks all for the input!

I purchased two 8GB Class 10 cards. I use one for storage and the other for Honeycomb and it runs great.

Can the Nook actually even use the speed of a class 10? I know many phones can only fully use 4 or 6, with the only benefit of 10 being faster transfer while connected directly to PC. Class 2 is just slow on everything, of course .

waiteck said:
i see... initially i thought there were issues with class10 16gb cards.
thanks all for the input!
Click to expand...
Click to collapse
I tried class 10 and class 4 16gb cards because I really wanted the space. I had all sorts of problems running on the class 10 once v04 honeycomb came out and the class 4 would run froyo and HC but it was so slow it couldn't be used. Some people seem to be using them but when I relaced it with a 8gb class 10 Patriot card, it runs great.
As to whether the nook can use a class 10, I don't know. I certainly know it MUCH faster with a class 10 than a class 4. I also bought a class 6 AData card but I have not tried it as a speed comparison. I was just tired of running back to the store to return them and test another so I bought two and started with the fastest one.
16gb might work with future versions but for now, I am sticking with 8gb cards.
I recommend the Patriot 8gb Class 10. The model I bought was the LX Signature Series: PSF8GMCSDHC10

therealguppy said:
If they are same class then you should get about the same speed off either and all your looking at is size... if you want 8gb of space get the 8gb if you want 16gb of space get that one instead.....
I would not recommend using anything lower than a Class 6 card however.
Click to expand...
Click to collapse
Not necessarily. Class only implies a guaranteed minimum WRITE throughput, e.g. class 4 = 4MB/s, class 6 = 6MB/s, etc. that a particular class of card is capable of supporting. There is no guarantee that the tablet, camera, etc. is actually capable of achieving/sustaining that throughput rate though.
Read throughput can be anything, but are usually close to write speed, and another factor not as important most of the time with tablets is the latency of r/w accesses.
In the pre-SDHC days Japanese made(Toshiba - only Japanese maker) uSDs were the best in terms of speed and latency, followed by most Taiwan(various) made cards. Chinese(various) made cards were the worst by FAR. Also the pre-SDHC uSDs had varying r/w throughput and latency depending upon how "full" they were with the same general rule as above applying as to where manufactured. Presumably this is not the case with SDHC as the class implies that regardless of how full a card is that it WILL maintain that minimum write throughput.
8 v. 16: From the pricing that I've seen 2 8GB cards are cheaper than a single 16GB -> 8GB a better deal IMO. e.g. class 6 8GB are <$15 while 16GB class 10 are >$35 at least on newegg...
Another factor to consider is that you likely don't need a class 10 card unless you happen to have a very high performance/high resolution digital video recorder... i.e. class 2 is likely even good enough for most tablet video and other applications, but since class 6 cards can be had at reasonable prices(online, b&m are profiteeringly insane in their markups) those would probably be the best choice.
[EDIT]
I'll let you know about class 4 4GB uSDs as a local b&M unbelievably has an approximately reasonable price on PNY(probably Taiwan) class 4 4GB uSDs, $10 which is cheap enough to pitch them if they're junk or use them for applications that don't require high throughput.
(On a side note most class 4 and class 6 uSDs work great with Nintendo DSes, which I'd suspect are MUCH more sensitive to throughput and access latencies... or so I've read...)
[/EDIT]

I see Stevr had posted which Patriot he had success with in Post #8 of this thread, and in the HC Preview v4 thread there have been a few negative posts about certain cards not livinig up to their class ratings... so I have to ask...
Is there a single thread recommending or comparing the various MicroSD cards, how they've worked for Froyo or HC booting/running off them? (i.e. a central posting of "this one works great..." or "this one is too slow"?)
EDIT: I found this talking about cards for Froyo from SD -> http://forum.xda-developers.com/showthread.php?t=946896 which has some makers, size and class.. no specific model numbers.

KidJoe said:
I see Stevr had posted which Patriot he had success with in Post #8 of this thread, and in the HC Preview v4 thread there have been a few negative posts about certain cards not livinig up to their class ratings... so I have to ask...
Is there a single thread recommending or comparing the various MicroSD cards, how they've worked for Froyo or HC booting/running off them? (i.e. a central posting of "this one works great..." or "this one is too slow"?)
EDIT: I found this talking about cards for Froyo from SD -> http://forum.xda-developers.com/showthread.php?t=946896 which has some makers, size and class.. no specific model numbers.
Click to expand...
Click to collapse
seems like alot of 16gb class 10 are having issues with running froyo off memory cards.
might get a 8gb class 10 instead. and a spare 16gb class 10.

[Q] About SD Card

Hello
I got my Legend about 2 months ago, and I have a big problem with storage space...
What is the biggest sized SD card the Legend can use?
What is the type of SD card (micro, mini, etc...)
What is SD card class?
Thank you very much

microSD compliant with SD2.0 Standard (aka microSDHC)
The biggest size available currently is 32GB.
I don't know if even more is possible with microSDHC or if bigger cards will only be possible with SD3.0 (aka SDXC) but that question is not relevant as you can't buy any greater then 32GB yet.
The Class of the SDCard is a measurement for guaranteed minimum speed in random read/write.
The Class does not provide any information about real-world speed or max speed.
For your mobile phone the class is a pretty useless criterion as you don't need any guaranteed minimum speeds but good overall speeds ESPECIALLY sequential.
The guaranteed minimum speed is important for HD Video Cameras for example where you write data all the time at a given speed (resolution).

thanks.
but I DO need class with high speed because I want to use Data2Ext...

Don't pick uSD card based on class !! class tels you MB/s for sequential write only... you need a card that is overall fast, I had 16GB class 10 Kingston and data2ext was just horrible!
Now I'm with class 4 Sandisk mobile ultra and it is in fact faster in every test I ran...
So read reviews before you buy

ye but that is exactly why im asking...

well then, I recommend sandisk mobile ultra as I have it and it is OK, there are probably faster cards...just see the small files read / write speeds in reviews those are of greatest importance

i purchased a kingston 8GB class 4 which crapped out. android kept reported sdcard unexpectedly removed. tried all sorts (formatting in windows, android, quick, long, etc).
RMA replacement did exactly the same, so i'm guessing kingston class 4's are best avoided.

If I recall correctly I have a 16GB microSDHC Class 4 card. After applying data2ext with this card, my Quadrant scores hit around 1500, which is crazy.
This is where I found my card: http://www.amazon.co.uk/SanDisk-16G...P06K/ref=sr_1_1?ie=UTF8&qid=1298984123&sr=8-1
I personally recommend this card.

witch is better class 4 or class 6?

r69001 said:
Hello
I got my Legend about 2 months ago, and I have a big problem with storage space...
What is the biggest sized SD card the Legend can use?
What is the type of SD card (micro, mini, etc...)
What is SD card class?
Thank you very much
Click to expand...
Click to collapse
Did you by any chance go to HTC's website to read about the phone? It has the full specs listed..
Sent from my Legend using XDA App

dangal said:
witch is better class 4 or class 6?
Click to expand...
Click to collapse
class 6 is better , but class 10 is even better

I've got a Sandisk Ultra Mobile 16gb SDHC which works fine in the Legend. Make sure you format it with the phone to stop it being dismounted, well known issue and the fix

Nook Color microSDHC speed class question

I very recently got a NC, and I've tried running both Froyo and Gingerbread from the microSDHC card. I'm using a Class 4 card, and I noticed that both seemed to lag quite a bit. Do you guys think I'd see a difference if I used a Class 6 or Class 10 card? Thanks!
--Adam

I think the most important question, is what brand are you using? The class ratings might mean something if they were enforced, but the sad fact is that they are not, which leads to lots of cheap, crappy cards out there.
I have a Kingston class 4 that barely makes class 2 speeds, and an 8GB Sandisk class 2 that falls between class 6 and 10 (in real world speed). If you get a GOOD card, running Froyo/GB from it will be smooth as butter (Running the posted custom Froyo on my Sandisk, and it is as fast as the stock ROM on the eMMC).

I believe the class number corresponds to the cards base transfer rate. For example class 4 is 4 mb/s, where class 10 is 10mb/s. Depending on the brand and how much you spend, class 10s can go even faster than 10mb/s. This is a significant difference, but I don't know how much it will actually affect the real performance of NF and HC on SD.
I just ordered a class 10 to see this for myself because I originally tried it on a class 4 card as well, and wasn't happy with it. I will post again when I try it.
Sent from my SCH-I500 using XDA App

I don't have the device with me (at work), but I think it's a Kingston, and I know it's Class 4
Divine_Madcat, would you recommend the Sandisk?

Is there a utility that people are using to TEST the speed of their micorSD cards, or are you just monitoring the transfer rate when moving files?

ovar said:
Is there a utility that people are using to TEST the speed of their micorSD cards, or are you just monitoring the transfer rate when moving files?
Click to expand...
Click to collapse
Good question, I'd be interested in knowing this also.

niphoet said:
I don't have the device with me (at work), but I think it's a Kingston, and I know it's Class 4
Divine_Madcat, would you recommend the Sandisk?
Click to expand...
Click to collapse
Very much so, yes. I am very displeased with my Kingston, after seeing how much better the Sandisk is. You will also be able to find lots of other happy Sandisk users here (And unhappy owners of other brands)..
ovar said:
Is there a utility that people are using to TEST the speed of their micorSD cards, or are you just monitoring the transfer rate when moving files?
Click to expand...
Click to collapse
niphoet said:
Good question, I'd be interested in knowing this also.
Click to expand...
Click to collapse
There are plenty of free drive benchmarks out there, but my real world tests are good enough for me. When i use either dd (linux) or the windows image burner for creating/backing up my Froyo images, i get a very solid indication of my transfers.

Divine_Madcat said:
There are plenty of free drive benchmarks out there, but my real world tests are good enough for me. When i use either dd (linux) or the windows image burner for creating/backing up my Froyo images, i get a very solid indication of my transfers.
Click to expand...
Click to collapse
Great thanks for the TIP.
Also, it may be beneficial for folks to post MicroSD cards they have had good performance with. Maybe get a core collection of solid SD cards for the Nook.

Divine_Madcat said:
Very much so, yes. I am very displeased with my Kingston, after seeing how much better the Sandisk is. You will also be able to find lots of other happy Sandisk users here (And unhappy owners of other brands)..
There are plenty of free drive benchmarks out there, but my real world tests are good enough for me. When i use either dd (linux) or the windows image burner for creating/backing up my Froyo images, i get a very solid indication of my transfers.
Click to expand...
Click to collapse
That's how I've tested mine but awkwardly have two 4gb sandisk sdhc class 4 an one gets 9-10mbs other gets 3-6mbs.
In market there is a benchmark for sd thats free (can't think of the name) but I believe the nook only manages 3-6mbs r/w no matter the SD.
sent From a NC on eMMC Froyo

ovar said:
Great thanks for the TIP.
Also, it may be beneficial for folks to post MicroSD cards they have had good performance with. Maybe get a core collection of solid SD cards for the Nook.
Click to expand...
Click to collapse
I've had great luck with the Kingmax Class-10 from buy.com so I bought 4 more 4 GB ones to keep test images to run from on...
http://www.buy.com/retail/usersearchresults.asp?querytype=home&qu=kingmax+sd&qxt=home&display=col
Was getting 14+MB/s write speeds, 20MB/s read when copying card to card using usb adapters... and got 2000+ quadrant scores running both 2.2 and 3.0 images from the sdcard w/1.1GHz kernel...

camwinnn said:
but I believe the nook only manages 3-6mbs r/w no matter the SD.
Click to expand...
Click to collapse
Really? That sucks.

niphoet said:
Really? That sucks.
Click to expand...
Click to collapse
I believe so, the benchmark (J disk) isn't free anymore but just try dragging over some movies or something big from the PC to the SD via nook, could just be mine but I saw others in irc talking about it.
sent From a NC on eMMC Froyo

the card i am using is a patriot 8gb class 4 i got from newegg. when i boot froyo, its extremely slow, and unresponsive. i do not reccomend. unfortunatly its the only sd card i have that actually booted the os.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220523

john10101 said:
the card i am using is a patriot 8gb class 4 i got from newegg.
Click to expand...
Click to collapse
Among the many cards I've tried I had the 16GB version of that (class 4) card. The Sandisk 16GB (class 4) I got bested the Patriot and oddly some others that were supposed to be Class 10. It was the only way I got Froyo and especially HoneyComb to run reasonably.

I just downloaded the app System Benchmark on my Evo and tested the Class 4 Sandisk in there:
Write: 7.1 MB/s
Read: 10.6 MB/s
Not too shabby at all, I think when I get home this baby is going in the NC.

niphoet said:
I just downloaded the app System Benchmark on my Evo and tested the Class 4 Sandisk in there:
Write: 7.1 MB/s
Read: 10.6 MB/s
Not too shabby at all, I think when I get home this baby is going in the NC.
Click to expand...
Click to collapse
It should run it amazingly. My SD gets 7.4 write, and 12.x read, and Froyo on it runs as smooth as elcair does. It has really become my daily driver.

On my Kingston class 6 I get 9mb/s write, on my Sandisk class 4 I get 3mb/s

I just installed System Benchmark from AnTutu also to have a dollars to dollars comparison and on my KingMax 4GB Class-10 in the NC running HC I get 9.9MB/s write and 18.5MB/s read... running the complete test takes forever though it seems...

MXIIA said:
On my Kingston class 6 I get 9mb/s write, on my Sandisk class 4 I get 3mb/s
Click to expand...
Click to collapse
Well, at least that's the expected outcome considering the Kingston class is higher. The sandisk class 4 card I have gives me ~ 5-6 Mb. If it's true that the NC can't benefit from more than 6 Mb then I won't ever need anything better.

I found with both my Kingston 4GB class 4 microSD and Kingmax 8GB class 10 microSD that the nook runs laggy. When I run Froyo off of the internal memory, it runs fabulously.
For reference, I got about 6MB/s on my Kingston Class 4 and 11MB/s on my Kingmax class 10. This was on my PC of course, I didn't test the speeds from then nook, but only noticed it lag and crash more often (compared with internal memory).

Best uSD card to run CM7

I just put one of the CM nightly builds (build38) on a uSD card (sandisk 16gb class 2) and there is a major lag to even enjoy the device. I have been reading about that sometimes class numbers on the cards don't mean too much.
Which card would you recommend to run CM from (Brand/class/where to buy) from your experience?

any class 6 card should be plenty enough (as long as it has enough room for the ROM and stuff) even class 4 should work much better (but still some lag i beleive, idk ive never tried it)
newegg is a pretty good place to shop for them. Heres one such card - newegg.com/Product/Product.aspx?Item=N82E16820211341&cm_re=8gb_micro_sd_card-_-20-211-341-_-Product

There is a long thread about this on here and the class 6 Transcend 8GB card got the most mentions for good perfomance. The probability for issues to arise increases when using cards over 8GB.
I have a class 2 Sandisk 8GB and class 6 Transcend 8GB card. They both work well.

I have been buying the Wintec cards from newegg for a couple months and run them in both my captivate and my nook they work awesome. Class 10 and fast. http://www.newegg.com/Product/Product.aspx?Item=N82E16820161411

Patriot Signature 8 GB Class 10 MicroSDHC
Did anybody have any experience with this card?
http://www.amazon.com/Patriot-Signa...I8MS/ref=sr_1_2?ie=UTF8&qid=1302629334&sr=8-2

rahlquist said:
I have been buying the Wintec cards from newegg for a couple months and run them in both my captivate and my nook they work awesome. Class 10 and fast. http://www.newegg.com/Product/Product.aspx?Item=N82E16820161411
Click to expand...
Click to collapse
Are you running a rom (e.g CM7) off the card? Did you ever run a speed test?

onurd said:
Are you running a rom (e.g CM7) off the card? Did you ever run a speed test?
Click to expand...
Click to collapse
Not at this time. What speed test would you like if I loaded one up on the card and booted from it?

onurd said:
Did anybody have any experience with this card?
http://www.amazon.com/Patriot-Signa...I8MS/ref=sr_1_2?ie=UTF8&qid=1302629334&sr=8-2
Click to expand...
Click to collapse
I used that card for HC v4 and it was fine.

I've got 4 uSD card: one Dane-Elec 2G no class, one Kingston 2G no-class, one Transend 4GB class 6 and one PNY 8GB class 4. All run CM7 very well, maybe I didn't pay attention but didn't notice much different in performance. In benchmark, the write speed is about 5-7 MB/s.
The higher capactity 16GB card seems to have more problems, other than that every card will do.

You should check into the random read/write performance of small files on these cards. sometimes the class 6 or 10 aren't all they are cracked up to be. Fast transfers of large file yes, but general performance can suck.
sandisk class 2 or 4 cards can have excellent perf. I have a class 10 that is outperformed by class 2/4 and 6 cards.
if you are having problems with crashing, etc. try a basic sandisk and see if perf. is better.
there is a thread about it but i can never find it.

Which SD Cards are the best ?

I couldn't find a real answer to this anywhere, but I plan on installing CM7 to an SD Card - and boot/run from the card.
Which class of SD card should I be shooting for - and why? Are there any certain brands that work well/don't work well? The same for sizes - is 16GB going to be faster than 32GB ?
Thanks. I'm shooting for a 16 GB internal which should be more than enough space.

Sandisk class 2 or 4
Sent from my LG Optimus V using Tapatalk

Search this forum and you will find that the Sandisk class 4 disks are great. The best part is they are available at most retail stores, if your impatient. I've been using a 16gb card for a while and it runs stable and smooth.

+1 vote for Sandisk

SanDisk class 4.
Sent from my NookColor using xda premium

SanDisk class 4, 16GB
see the other topics here about sd cards, there are some good known resellers on Amazon who have real SanDisk cards, not the fakes that you can finds for cheaper some places online.

Are there known issues with other brands or faster (eg; class 6 / 10) SD cards on the NC, or is it just when booting the likes of CM7 from them?

SamboNZ said:
Are there known issues with other brands or faster (eg; class 6 / 10) SD cards on the NC, or is it just when booting the likes of CM7 from them?
Click to expand...
Click to collapse
Some other cards do have known issues or possibly don't live up to their speed class rating. You might get lucky and get a decent one out of a bunch, but its very hit or miss. Other cards have also been known to die after using them for a bit.
If you're looking for something that is reliable and is consistent, then stick with SanDisk class 4.

SamboNZ said:
Are there known issues with other brands or faster (eg; class 6 / 10) SD cards on the NC, or is it just when booting the likes of CM7 from them?
Click to expand...
Click to collapse
I tried A-data 4GB and 8GB class 6, they both run great, tried a generic 16GB class 4, horrible slow. Haven't try any SanDisk yet.

sandisk 8gb class 4 seems to work ok for me
if i went anything larger than 8gb i would want above class 4 speeds i think

Read first post here:
http://forum.xda-developers.com/showthread.php?t=1005633
sandisk CL4, 8GB and 16GB seem to be the best bet. faster cards appear to be optimized for speed and large file transfers, but the CL4 and slower cards have better small file read/write speeds.
runnnig CM7 off the card, you want the better small file read/write speeds from the CL4 and slower cards.
~mike

Anyone tested any Sandisk Class 6 cards?

Amazon Basics class 10 sdcards work pretty good for me...but i have never run a rom from the actually sd card.
But for $28 (16gb) it actually is class 10-i have all my music and videos and they all perform well. I used to get force closes on my music player back when i had music on internal memory but now that its on external sd i have no force closes
In conclusion the 16gb class 10 amazon basics for $28 has improved my phone satisfaction
Sent from my SAMSUNG-SGH-I997 using XDA App

Found one result for a Sandisk Class 6:
http://forum.xda-developers.com/showpost.php?p=21268438&postcount=317
Seems to perform well!

This does not hold if you are running off the card. I have a 16GB class 6 Kingston and it runs terribly slow. My class 4 sandisk 16GB runs great.
Sent from my NookColor using Tapatalk

prettedda said:
This does not hold if you are running off the card. I have a 16GB class 6 Kingston and it runs terribly slow. My class 4 sandisk 16GB runs great.
Sent from my NookColor using Tapatalk
Click to expand...
Click to collapse
+1
Before I committed to emmc my lower class cards ran faster.
Sent from my GT-P7510 using one finger.

What monkeymike said.
Pretty much if you get anything but a class 2 or 4 Sandisk(i'd say class 4 for best of both worlds), you run a risk of an unstable system. The benchmark tests seem to put them many orders of magnitude above the higher class cards of other brands.
Plus they seem to be on special just about anywhere i've asked for them. Try radioshack if you are in the US.

I think you'll find that extensive benchmarking of a heap of cards has shown that the ones which are slow to boot are the same ones which have very low 4k random write speeds (as per monkeymike's post reference). The Sandisk 16GB Class 6 cards appear to have decent speeds for 4k random writes, ergo they will be fine to boot from. Other class 6 cards don't perform nearly as well as the Sandisk ones.

I've seen numerous benchmarks around the web showing that the Sandisk class 4's consistently match or beat the class 10's from other manufacturers and I've had great results with them in both my NC and my phones.
That said, its not going to run as well from an SD card (any sd card) as it will when properly installed as the main OS. I know this from experience. I was running CM7 from a generic class 2 for a while and it sucked. Then I got a Sandisk 16gb class 4 and that made a huge difference in usability. But over the weekend I finally took the plunge and actually installed CM7 directly on the NC-and that is a huge improvement over even the best SD card. Still, the Sandisk class 4 is a good way to test the waters.