Database Develop

Can the HD2 benefit from class 6 SD? Or is it a bottleneck >Class 2?

I ordered a class 6 16gb card to replace the slow-ass class 2 8GB card I had in my HD2.
First of all I couldnt find the format sd tool in my energy rom (1st July) so I had to format the card using vista while the HD2 was connected in disk drive mode. THAT TOOK OVER 1 HOUR.
(Is there a cab file to install the "Format SD Card" tool for the newer energyroms?)
Anyways after formatting (Fat 32, 16KB cluster), I started to copy my 1.4GB sd backup file to the card using the same method as above (disk drive mode)....
My maximum write speed was 2.7MB/sec. Average 2MB/sec.
Class 2 speeds????
After restoring the backup, which took forever, I ran spb benchmark on the card and was gutted to get slightly lower results than the old class 2 I was replacing.
Can the HD2 make use of anything faster than a class 2 card?
Has anyone here tested a class 6 or even 4 card and found good write speeds (~6MB/sec, or ~4MB/sec)?
Does it sound like I have bought a lemon (class 2 labelled as class 6)?
I have spoken to the seller and he is adamant that they ARE genuine class 6. Reckons he tested some of the batch in TrueHD cameras which will not accept <Class6. Seems genuine and some of his feedback states that the cards are Genuine class 6. Which leads me to think that the bottleneck could be the HD2... Does that sound likely?
I'm waiting for a microsd USB reader to arrive so I can test the card outside of the HD2, but Until I can do that... can anyone tell me if a class 6 is wasted in a HD2?
The strange thing is that when browsing photos/wallpapers etc, the thumbnails ARE loading maybe 3x quicker than my old class 2. So I'm pretty confused about this one.
Can anyone shed any light here? Feel free to post benchmark results/screenshots etc.
Thanks in advance.

can anyone PLEASE answer this ^^^?
Is there any point having a class 6 card in the HD2 instead of a class 2 or 4 card?

there is a thread in the accessories section have a gander in there, I no this is Q&A's but lots of talk about mem cards in the accessories section mate

Cheers mate, I'll take a look.

I will move this thread there. I also recently bought a Class 6 card and and have seen a huge improvement in media reading and over all performence.

I get 4-5MB/s both for reads writes with my 16GB class 6 card in disk drive mode.

Thanks zelendel and kilrah.
kilrah said:
I get 4-5MB/s both for reads writes with my 16GB class 6 card in disk drive mode.
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That is exactly the kind of data I'm looking to compare.
Whith my 'class 6' Im getting just under 3MB/S WRITE and under 6MB/S READ when using the HD2 in disk drive mode.
If I use the card in a USB 2.0 reader I can get around 5.5MB/S Write and ~11-13MB/S read.
Based on this alone would you say my card is a class 6 or not. I'm beginning to think it may be a class 4 re-labelled.
Picture browsing etc is faster with my class 6 but all benchmarks indicate it is identical speed to my genuine Kingston Class 2.
What do you guys reckon, Should I send this card back for a refund???

Well if you're getting 5.5 and over 11MB per second with a card reader then we can safely assume it's class 6. The bottleneck is something to do with the phone, rom, cable or simply the phone doesn't like this particular card etc...
EDIT: Test your class 2 card with the memory card reader and see if you get similar results.

ez2remember said:
Well if you're getting 5.5 and over 11MB per second with a card reader then we can safely assume it's class 6. The bottleneck is something to do with the phone, rom, cable or simply the phone doesn't like this particular card etc...
EDIT: Test your class 2 card with the memory card reader and see if you get similar results.
Click to expand...
Click to collapse
Thank you for helping me clear things up.
Comparing the 'class 6' and the 'class 2' transfer speeds is where I really get confused here.
Transferring a ~700MB .Avi to and from SD using a reader:
Kingston Class 2 8GB:
Read 12.5MB/s
Write 5.4MB/s
Unbranded Class 6 16GB:
Read 12.5MB/s
Write 6MB/s
So, from this, would you say its safe to assume:
1. The class 2 card is a good one, performing at almost class 6 speeds.
2. The class 6 card is 'Genuine' and shouldnt be returned.
3. There is a bottleneck when using the HD2 as a card reader/disk drive. I should be getting more than 2.5mb/s write speeds in this mode.
4? Does 12.5MB/sec sound close to USB 1.1 speeds? could my reader or even USB port (Vista laptop) be another bottleneck?
Once again thank you for helping me make sense of all this.
At least I now know that the 16gb card doesnt really need to be returned.
Can you give me your oppinions on the above?

Well class 2 means you should be getting a minimum 2MB/s speeds and class 6 means you should be getting a minimum 6MB/s.
Seems like you have a very good class 2 card.
More info here
http://en.wikipedia.org/wiki/Secure_Digital
Your class 6 is performing to spec.
Personally I would never buy an unbranded card but that's me. A branded card may perform better than there class rating e.g. Your Kingston brand I've always used Sandisk personally...

I've just managed to drum up enough funds to get myself a HD2 and now looking to upgrade my HCSD card to 16GB. To get the "right" class I tried to find the spec on the SD interface but I cannot find anything and the best data I can find is that I shouldn't waste my money on unbranded devices, I would always buy a SANDISK device for something I relied on! For data and communication!
People seem to get appropriate speeds for the class of device they have, if they are branded and sometimes if unbranded. However, there doesn't seem to be anything better than class 6 results debated or given. Is it a VERY rash assumption that the fastest the HD2 interface can go is Class 6?
Chris

Does this mean its not worth getting 32gb cos its a class2
& theat would make the phone slower cos lot more stuff on it
& will take more loading time & play Videos lagy ?
anyone useing 32gb ?
Thanks

My experience was positive with higher class micro SD.
At first, I used 8GB micro SD bundled with my HD2 and didn't notice improved loading speed. Later, I changed it with higher class one, same 8GB, with same manufacturer, Sandisk. Higher class one has name "Ultra" on it. Now with changed SD, loading became WAY faster. "Wow" I realized the higher speed of CPU of HD2.
My 2 pennies.

NEVER EVER buy unbranded memory cards!
Keep an eye on Sandisk cards only and even prefer them to Transcend and Kingston.

Difference between Sandisk Ultra microsd card and normal card?

I'm going to buy a 16GB microsd card from sandisk. I've been finding on Amazon and found these two products:
Sandisk 16GB Mobile Ultra MicroSD Card : £36.00
SanDisk 16GB microSDHC Memory Card : £15.99
I've also noticed they're all class 2 (can't find a class 4 or class 6 sandisk). So what is the difference between them? I'm using the card for Windows Phone 7, so which one should I buy?

http://en.wikipedia.org/wiki/SD_Memory_Card#SDHC_cards_with_greater_than_32.C2.A0GB_capacity
as I understand it the only advantage of SDHC is an increased card storage. And im not sure if an SDHC card works in the HD2.

uxu said:
http://en.wikipedia.org/wiki/SD_Memory_Card#SDHC_cards_with_greater_than_32.C2.A0GB_capacity
as I understand it the only advantage of SDHC is an increased card storage. And im not sure if an SDHC card works in the HD2.
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Both of them should be SDHC (>2GB). I'm asking about the Ultra thing.

Zell Dinch said:
Both of them should be SDHC (>2GB). I'm asking about the Ultra thing.
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Click to collapse
Sorry, got it wrong

They're the same thing. One has an adapter however

Ultra means it has higher transfer speeds.
There's also Ultra and Extreme in the regular SDs.
Ultra=15 mb/s
Extreme=30 mb/s
So it's all about speed.

@apallohadas: they have different model number, one is SDSDQY-016G-E11M and one is SDSDQ-016G-FFP. And I suspect that just a card reader will make that difference in price.
@joooe: but they're both class 2?

I've tried several different class cards in my HD2, and regardless of advertised 'class' r/w speeds only changed noticeably if I took it out of my phone and used a card reader or adapter like shown in the "ultra" listing you have.

apallohadas said:
I've tried several different class cards in my HD2, and regardless of advertised 'class' r/w speeds only changed noticeably if I took it out of my phone and used a card reader or adapter like shown in the "ultra" listing you have.
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Hello apallohadas
can you confirm or any one without any doubt that there is no difference in R/W speed between class 2 or class 4 or class 6 inside HD2 with Windows 6.5 or Android
thanks

secoseco said:
Hello apallohadas
can you confirm or any one without any doubt that there is no difference in R/W speed between class 2 or class 4 or class 6 inside HD2 with Windows 6.5 or Android
thanks
Click to expand...
Click to collapse
I don't have Winmo installed on my phone anymore, so I can't rerun that test and I didn't keep the numbers last time that I did it.
But if you'd like to try testing cards yourself, I used a program called H2test and a card adapter. My Class 2 Sandisk 32GB card gave numbers comparable to a class 6 Transcend 16GB.
Inside of the HD2 however, while on Android the tests take too long (setting read/write file sizes of 1GB+.) I've read in several places that the hardware limits performance as though they were all class 2 cards.

There are reviews where a class 4 card is superior to a class 6 card.
Sandisk cards are just great.
In the sandisk website there is no info about the class of both cards. Don't believe they have the same class.

apallohadas said:
I I've read in several places that the hardware limits performance as though they were all class 2 cards.
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thank you apallohadas for replay
I think so, hardware limitation to Class 2 with HD2 although I read in several places that there is more performance with Class 6 or 10 card in Android especially SD Android
I have Sandisk 16G class 2 and want to upgrade to 32G and I don't want to wast my money in useless class 6 or 10 with my EU HD2,
any one use Sandisk class2 then upgrade to class4 or 6 with EU HD2 and get faster performance in read and write inside HD2 not as disk drive ??
thanks

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!
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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.

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
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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.

Class 4 san disk cards are better than class 10 san disk cards for dual booting?

I was reading this forum post which claimed that a class 4 card is actually faster than a class 10 card for Cyanogenmod on the microsd card. Is that true? I currently have the 64GB san disk class 10 card (the red/grey one) as my card. It does tend to lag a bit if i'm swiping from one home screen to another. Would a class 4 card give me smoother performance?
http://forums.anandtech.com/showpost.php?p=34988392&postcount=30

If it's a Sandisk class 10, it's probably fine.
What the problem is that Sandisk's class 4 cards often perform better than the class 10 cards from other manufactures like Patriot. I have a class 4 Sandisk and a class 10 Patriot and the Sandisk is superior at 4k performance. But the class 10 Sandisk is probably fine (assuming it's a real Sandisk and not a counterfeit).

Ravynmagi said:
If it's a Sandisk class 10, it's probably fine.
What the problem is that Sandisk's class 4 cards often perform better than the class 10 cards from other manufactures like Patriot. I have a class 4 Sandisk and a class 10 Patriot and the Sandisk is superior at 4k performance. But the class 10 Sandisk is probably fine (assuming it's a real Sandisk and not a counterfeit).
Click to expand...
Click to collapse
Thanks, oh you're Ravynmagi from that same thread eh? Hahaha

Class 10 cards are best for long r/w for large files or a video camera. Most of what the tablet or phones do are shorter r/w and a class 6 or 4 will do fine or even be superior. This is particularly true for cards that are used for part of the operating system. This info was gleaned from experience with Android, NativeSD roms. If you search nativesd + hd2 there much info.
Many of the class 10 labeled cards are mislabeled anyway. A name brand like Sandisk will be more quality tested and properly labeled.

Hello guys, this is my first post here. Instead of starting a new thread, I thought it'll be appropriate to post in a thread about sd cards. I'm planning to buy microsd cards for my new Nook HD+, which is on the way. Does UHS-1 micreosd cards work with Nook HD+? I want to dual boot with cynagen mod on sd card. Which class'll be the best for running android from the sdcard? Also I want to make a back up of my Nook HD+ stock version, what size card is enough for that?
The card that I have in mind is a Strontium 16GB UHS-1 MicroSDHC Card. In its product description it says "Compatible with SDHC and SDXC host devices; not compatible with standard SD-enabled devices/readers" and "Compliant with the new UHS-I specification for ultra-high speed interfaces for SD specifications. Can only be used in UHS-I mode in UHS-I compatible devices." (I can't post link since it's my first post)
I got confused after reading that highest class won't give optimal performance. I hope some one here will help me in this. Thank you.

mashac said:
Hello guys, this is my first post here. Instead of starting a new thread, I thought it'll be appropriate to post in a thread about sd cards. I'm planning to buy microsd cards for my new Nook HD+, which is on the way. Does UHS-1 micreosd cards work with Nook HD+? I want to dual boot with cynagen mod on sd card. Which class'll be the best for running android from the sdcard? Also I want to make a back up of my Nook HD+ stock version, what size card is enough for that?
The card that I have in mind is a Strontium 16GB UHS-1 MicroSDHC Card. In its product description it says "Compatible with SDHC and SDXC host devices; not compatible with standard SD-enabled devices/readers" and "Compliant with the new UHS-I specification for ultra-high speed interfaces for SD specifications. Can only be used in UHS-I mode in UHS-I compatible devices." (I can't post link since it's my first post)
I got confused after reading that highest class won't give optimal performance. I hope some one here will help me in this. Thank you.
Click to expand...
Click to collapse
SanDisk class 4 are the best to use for everything on the HD/HD+. The device does not work reliably with faster cards.
You need about 1.5GB to do a stock backup, so a 2GB is enough.
Sent from my Nook HD+ running CM10.1 on emmc.

leapinlar said:
SanDisk class 4 are the best to use for everything on the HD/HD+. The device does not work reliably with faster cards.
You need about 1.5GB to do a stock backup, so a 2GB is enough.
Click to expand...
Click to collapse
Thanks leapinlar for that quick reply. So, a 16 or 32GB class 4 sandisk card for the dual boot and another 2GB card for the stock backup is all I need. Thanks again.

The "class' rating is only a measure of large sequential write performance, as in using it for an HD video camera. The class rating has no bearing at all on random access speeds or small reads and writes. Many sandisk class 4's have faster small random read/write performance than many class 10 cards, but its worthwhile to look at benchmarks for a card you're looking at or a list of top cards for tablet/phone usage that keys on small random read/write performance for optimal performance.
In fact, the sd card market is loaded with class 10 cards that stink at pretty much every other measure than large sequential writes.

SD cards 16G and larger are only made as class 10 devices. Properly formatting the SD card will improve it's performance.

Onageric said:
SD cards 16G and larger are only made as class 10 devices. Properly formatting the SD card will improve it's performance.
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Click to collapse
No they are not. Here is a 32GB class 4 SanDisk available http://www.mymemory.co.uk/Micro-SDHC/SanDisk/SanDisk-32GB-Micro-SD-(SDHC)-Card---Class-4

artesea said:
No they are not. Here is a 32GB class 4 SanDisk available http://www.mymemory.co.uk/Micro-SDHC/SanDisk/SanDisk-32GB-Micro-SD-(SDHC)-Card---Class-4
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Click to collapse
To be more specific - SD cards 16G and greater are manufactured to meet class 10 standards. To get the most money from their products the production line is optimized to make the fastest and most expensive product. Products that miss the QC marks for "A" grade (class 10) will/should easily pass "B" grade (class 4) specifications. The class 10 data bus can run at faster speeds than a class 4. It can also
r u n s l o w e r, meeting fully the class 4 specifications. Often manufacturers will mark their perfectly good class 10 products as class 4 to fulfill market demands. Think making money.

Onageric said:
Often manufacturers will mark their perfectly good class 10 products as class 4 to fulfill market demands. Think making money.
Click to expand...
Click to collapse
It's seems to be true. Bought "Exployd 4 class micro SD" and it's running at 10 class speed at read/write (always over 12Mb).

See this thread http://forum.xda-developers.com/showthread.php?t=1005633 for extensive discussions of comparative performance of different vendor/model SD-cards. For the purpose of running ROMs, look out for cards with high throughput in randomized read/write access, not in sequential read/write access.
FWIW, I am using exclusively Sandisk class 4, having had terrible results (lots of Wait & Force-Close) with class 10 and 6 cards from a mix of vendors.