32GB microsd cards

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r2beta0

Senior Member
Nov 8, 2010
482
121
Rio de Janeiro
Sandisk 32GB MicroSD Class 4 (SDSDQM-032G-B35A)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.647 MB/s
Sequential Write : 4.601 MB/s
Random Read 512KB : 18.476 MB/s
Random Write 512KB : 1.150 MB/s
Random Read 4KB (QD=1) : 2.946 MB/s [ 719.2 IOPS]
Random Write 4KB (QD=1) : 1.308 MB/s [ 319.3 IOPS]
Random Read 4KB (QD=32) : 3.253 MB/s [ 794.2 IOPS]
Random Write 4KB (QD=32) : 1.423 MB/s [ 347.4 IOPS]

Test : 100 MB [D: 0.3% (0.1/29.7 GB)] (x5)
Date : 2012/01/03 17:43:02
OS : Windows 7 SP1 [6.1 Build 7601] (x86)
 

r2beta0

Senior Member
Nov 8, 2010
482
121
Rio de Janeiro
OEM Samsung Class 2 MicroSDHC Memory Card 8GB (MMB3R08GUACA-GE, shipped with Motorola Milestone2)

-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 13.911 MB/s
Sequential Write : 4.745 MB/s
Random Read 512KB : 13.495 MB/s
Random Write 512KB : 0.717 MB/s
Random Read 4KB (QD=1) : 2.730 MB/s [ 666.6 IOPS]
Random Write 4KB (QD=1) : 0.017 MB/s [ 4.2 IOPS]
Random Read 4KB (QD=32) : 2.778 MB/s [ 678.2 IOPS]
Random Write 4KB (QD=32) : 0.016 MB/s [ 4.0 IOPS]

Test : 100 MB [D: 78.2% (5935.3/7588.0 MB)] (x5)
Date : 2012/01/04 9:04:45
OS : Windows 7 SP1 [6.1 Build 7601] (x86)
 

314

Senior Member
Sep 4, 2011
166
35
Sydney
Isn't class of the card was meant to indicate the Write speed in MB/s According to wikipedia at least, so how are Class 2 cards getting 10+MB/s write speeds?



Kingston Class 4 32GB Card in Optimus 3D
Code:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    18.866 MB/s
          Sequential Write :     4.685 MB/s
         Random Read 512KB :    18.903 MB/s
        Random Write 512KB :     1.830 MB/s
    Random Read 4KB (QD=1) :     4.637 MB/s [  1132.1 IOPS]
   Random Write 4KB (QD=1) :     0.533 MB/s [   130.0 IOPS]
   Random Read 4KB (QD=32) :     4.482 MB/s [  1094.2 IOPS]
  Random Write 4KB (QD=32) :     0.493 MB/s [   120.4 IOPS]

  Test : 50 MB [I: 20.5% (6.1/29.9 GB)] (x5)
  Date : 2012/01/04 22:14:02
    OS : Windows 7 Home Basic Edition SP1 [6.1 Build 7601] (x64)



LG Optimus 3d Internal storage (I thought internal memory was faster than cards by alot)
Code:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    19.476 MB/s
          Sequential Write :     8.280 MB/s
         Random Read 512KB :    18.758 MB/s
        Random Write 512KB :     3.897 MB/s
    Random Read 4KB (QD=1) :     4.307 MB/s [  1051.4 IOPS]
   Random Write 4KB (QD=1) :     0.658 MB/s [   160.7 IOPS]
   Random Read 4KB (QD=32) :     4.475 MB/s [  1092.5 IOPS]
  Random Write 4KB (QD=32) :     0.692 MB/s [   168.9 IOPS]

  Test : 50 MB [H: 49.4% (2819.5/5708.4 MB)] (x5)
  Date : 2012/01/04 22:18:41
    OS : Windows 7 Home Basic Edition SP1 [6.1 Build 7601] (x64)
 

Enes_81

Senior Member
Feb 26, 2011
230
34
Samsung Micro SDHC 32GB Class 10 |after one week.

It has been a week Since I got my Samsung Micro SDHC 32GB Class 10.
In thay week I filled the card to 34% of its capacity.

So today I did a new benchmark, the same way as I did previous
Press to see my previous post

As you can see below the results are almost the same as my previous results.
So again the 4K Read speeds via USB cable are 4 times slower then with the SD adapter. But on the other side 4K write is 60% higher via USB cable.

If you can get this card for €30/$40 like me, I think you should buy it.


Samsung 32GB Class 10 via SD adapter.
Code:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    23.638 MB/s
          Sequential Write :    12.255 MB/s
         Random Read 512KB :    23.199 MB/s
        Random Write 512KB :    11.920 MB/s
    Random Read 4KB (QD=1) :     7.305 MB/s [  1783.4 IOPS]
   Random Write 4KB (QD=1) :     1.250 MB/s [   305.1 IOPS]
   Random Read 4KB (QD=32) :     7.799 MB/s [  1904.0 IOPS]
  Random Write 4KB (QD=32) :     1.267 MB/s [   309.4 IOPS]

  Test : 100 MB [F: 34.0% (9.9/29.2 GB)] (x3)
  Date : 2012/01/04 20:15:34
    OS : Windows 7  SP1 [6.1 Build 7601] (x64)
    Samsung 32GB Class 10 via SD adapter.

Samsung 32GB Class 10 mounted in my HTC Incredible S and connected via USB cable
Code:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    18.873 MB/s
          Sequential Write :     9.801 MB/s
         Random Read 512KB :    21.474 MB/s
        Random Write 512KB :    10.420 MB/s
    Random Read 4KB (QD=1) :     1.990 MB/s [   485.9 IOPS]
   Random Write 4KB (QD=1) :     2.010 MB/s [   490.6 IOPS]
   Random Read 4KB (QD=32) :     1.979 MB/s [   483.2 IOPS]
  Random Write 4KB (QD=32) :     2.028 MB/s [   495.1 IOPS]

  Test : 100 MB [G: 34.0% (9.9/29.2 GB)] (x3)
  Date : 2012/01/04 20:39:56
    OS : Windows 7  SP1 [6.1 Build 7601] (x64)
    Samsung 32GB Class 10 via USB cable.
 
Last edited:

Smartie36

Senior Member
Oct 4, 2011
206
24
Shame I didn't come across this thread a few weeks back which was when I brought the lexar 32gb class 10 card, so far I've had my Galaxy S2 report the card as corrupted once but what I've also experienced is random reboots when updating apps that are installed on the card.

Currently carrying out a full format with 64kb allocation unit size to see what that does but it looks like this card isn't stable if you choose to install apps to it, to use it just for music & video files is ok, well I've never had any issues watching video files or listening to my music collection & they're all stored on the card.
 

theo2

Senior Member
Jun 18, 2010
106
8
Code:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

           Sequential Read :    18.017 MB/s
          Sequential Write :    12.492 MB/s
         Random Read 512KB :    17.762 MB/s
        Random Write 512KB :     1.441 MB/s
    Random Read 4KB (QD=1) :     2.924 MB/s [   713.8 IOPS]
   Random Write 4KB (QD=1) :     0.013 MB/s [     3.3 IOPS]
   Random Read 4KB (QD=32) :     3.542 MB/s [   864.8 IOPS]
  Random Write 4KB (QD=32) :     0.014 MB/s [     3.3 IOPS]

  Test : 50 MB [D: 4.3% (1.3/29.8 GB)] (x5)
  Date : 2012/01/05 19:18:40
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
    PNY 32GB Micro SD Card Class 10



Uploaded with ImageShack.us

http://www.amazon.de/gp/product/B0053AVTFW/ref=olp_product_details?ie=UTF8&me=&seller=

Should i keep this sdcard?

I tested with a sd adapter on my netbook:

Intel core 2 duo processor SU7300; 1.3.GHZ, 800 MHz FSB, 4gb Ram
 

SAI Peregrinus

Senior Member
Dec 14, 2010
53
19
Thanks for the info and handy tools. It will be interesting to see what happens with Android and SDXC cards, since they require the proprietary exFAT. So for cards 64Gb and above we may run into problems with some phones/roms.
 

nieohl

Senior Member
Sep 8, 2011
790
44
idk about those 32gb micro sd card.. but i was wondering if how is the best class, is it 10? or lowest value of class is the best quality sd card? because i'm planning to buy one. thanks!
 

Nikotttin

Member
Mar 13, 2009
24
3
Just to summarize for those who are looking (like I was):

SanDisk 8GB Class 6
Random Write 512KB : 4.629 MB/s
Random Write 4KB (QD=1) : 0.052 MB/s [ 12.7 IOPS]
Random Write 4KB (QD=32) : 0.058 MB/s [ 14.2 IOPS]

32GB Class 4 Sandisk
Random Write 512KB : 0.625 MB/s
Random Write 4KB (QD=1) : 1.467 MB/s [ 358.2 IOPS]
Random Write 4KB (QD=32) : 0.150 MB/s [ 36.5 IOPS] 1.3, 0.9,


32GB Class 2 Sandisk
Random Write 512KB : 3.5 MB/s
Random Write 4KB (QD=1) : 0.303 MB/s [ 358.2 IOPS]
Random Write 4KB (QD=32) : 0.68 MB/s [ 36.5 IOPS]

Samsung Class 2 MicroSDHC Memory Card 8GB
Random Write 512KB : 0.717 MB/s
Random Write 4KB (QD=1) : 0.017 MB/s [ 4.2 IOPS]
Random Write 4KB (QD=32) : 0.016 MB/s [ 4.0 IOPS]

Kingston Class 4 32GB Card
Random Write 512KB : 1.830 MB/s
Random Write 4KB (QD=1) : 0.533 MB/s [ 130.0 IOPS]
Random Write 4KB (QD=32) : 0.493 MB/s [ 120.4 IOPS]

Samsung 32GB Class 10
Random Write 512KB : 11.920 MB/s
Random Write 4KB (QD=1) : 1.250 MB/s [ 305.1 IOPS]
Random Write 4KB (QD=32) : 1.267 MB/s [ 309.4 IOPS]

I've put just the write speeds, since this is the bottle neck.
 
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Pyloge

Senior Member
Nov 20, 2011
103
31
Just to summarize for those who are looking (like I was):

Samsung 32GB Class 10
Random Write 512KB : 11.920 MB/s
Random Write 4KB (QD=1) : 1.250 MB/s [ 305.1 IOPS]
Random Write 4KB (QD=32) : 1.267 MB/s [ 309.4 IOPS]

I've put just the write speeds, since this is the bottle neck.
List Price: $88.99
Price: $79.95

Holy ... :O Reading/Writing speed very good but price is really bad. If you add 150 Dolar this price you can buy a new low-end android phone :eek:
 

Enes_81

Senior Member
Feb 26, 2011
230
34
List Price: $88.99
Price: $79.95

Holy ... :O Reading/Writing speed very good but price is really bad. If you add 150 Dolar this price you can buy a new low-end android phone :eek:

Well that is indeed expensive, but that card costed me only 40 dollar in Holland.
 
Last edited:

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  • 91
    Lots of threads and lots of info.
    This is purely my review ( based on the info i got from many places) on the topic.


    How to test your memory card - see post 2


    Hope this helps somebody
    I will be updating the thread as more info comes in from users.

    My recommendation after playing with all sorts of microsd cards and speeds is to get a sandisk 32gb card ( the new sandisk cards do not show a class speed , except for their ultra and extreme cards - This is their new policy )

    Why this recommendation

    - Randrom read write is the most important for speed during normal phone performance and i have seen sandisk cards have it the highest .
    HERE IS A POST FROM SOMEONE IN XDA. Forgot the source
    Class 2 and 4 cards have better random access speed and random read/write than class 6 or 10 cards in general. To get higher sequential write speeds, manufacturers sacrifice the random access speeds. That's just how it is.
    The best all around card I've ever found is Sandisk class 4.
    My 32gb Sandisk class 4 outperforms any other class 10 or 2 32gb card I've tested in the random access and random read/write speeds. That's what's most important when using with WP7 or Android when using it for apps or OS files that need to be accessed quickly. Class 6 and 10 cards are setup to initialize the area of the card that is about to be used to make the sequential write/read quicker, but it takes extra time in the beginning to do the initialization. If your using the card where you need to access small bits of info from various parts of card quickly, you will do best with class 2 or 4.
    Most people seem to assume that the higher the class, the better the card is for everything, but that's not how it is. Different purposes need different kinds of speed... cards with higher sequential speeds have lower random speeds.

    ( quoted from one of the users in xda )

    - Lexar class 10 ( I paid 94 $ for this :-( ) has terrible random speeds. The worst infact. Some of the other class 10 cards like kingston, patriot, topram have higher random speeds. However failure rate of some of these cards ( except kingston is high)

    - Sandisk 32gb is relatively cheaper and very reliable.

    - However if you are interested in regular copying of large files , like for eg : daily trnasfer of lots of music and movie files it might be better to get a class 10 card.

    here are some of the links where cards are discussed about

    newegg user reviews
    http://www.newegg.com/Product/Product.aspx?Item=N82E16820220547


    amazon user reviews
    http://www.amazon.com/Lexar-MicroSD...dp_top_cm_cr_acr_txt?ie=UTF8&showViewpoints=1

    xda discussion about various class of cards
    http://xdaforums.com/showpost.php?p=13161740&postcount=26

    I list I found of 32GB microSDHC cards:

    Class 10
    - Lexar 32GB High-Speed microSDHC Mobile (LSDMI32GBSBNAR)
    - Patriot Signature 32GB Class 10 microSDHC Card (PSF32GMCSDHC10)
    - Wintec FileMate Mobile Professional SDHC - Class 10 (3FMUSD32GBC10-R)
    - TOPRAM 32GB Class 10 MicroSDHC Card (TRmicroSD32G_C10)

    Class 6
    - Komputerbay 32GB microSDHC Class 6

    Class 4
    - SanDisk MicroSDHC 32GB Class 4 Card (SDSDQM-032G-B35, SDSDQM-032G-B35A, SDSDQM-032G-B35N)
    - Kingston 32GB microSDHC Flash Card (SDC4/32GB)
    - Transcend 32GB microSDHC CARD Class 4 (TS32GUSDC4)
    - Patriot Signature 32GB Class 4 (PSF32GMCSDHC43P)
    - 3C Pro 32GB Class 4 microSDHC Card (3C_TF32G_C4)
    - TOPRAM 32GB Class 4 microSDHC Card (TRmicroSD32G)

    Class 2
    - SanDisk microSDHC 32GB Card (SDSDQ-032G-A11M) [North American Version]
    - SanDisk microSDHC 32GB Card (SDSDQ-032G-P36M) [Pacific Rim Version - should be the same as North America]
    - SanDisk microSDHC 32GB Card (SDSDQ-032G-E11M) [related to MemoryVal?]
    - Transcend 32GB microSDHC with SD Adapter (TS32GUSDHC2)
    - Dane Elec 32GB microSDHC with SD Adaptor (DA-2IN1-32G-R)
    - Duracell 32GB microSDHC with SD Adaptor (DU-2IN1-32G-R) [likely the same as the Dane Elec DA-2IN1-32G-R]

    Editing to add more information

    The link below is to the speed testing of many micro sd card. Very useful

    http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172


    I am pasting the info from that thread here

    screenshot20110611at120.png


    screenshot20110611at120.png

    ____________________________________________________________________

    Some test results posted in this thread

    ____________________________________________________________________

    Patriot 32gb class 10

    -----------------------------------------------------------------------
    CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
    Crystal Dew World : http://crystalmark.info/
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 19.282 MB/s
    Sequential Write : 10.477 MB/s
    Random Read 512KB : 19.071 MB/s
    Random Write 512KB : 1.059 MB/s
    Random Read 4KB (QD=1) : 7.335 MB/s [ 1790.7 IOPS]
    Random Write 4KB (QD=1) : 0.247 MB/s [ 60.2 IOPS]
    Random Read 4KB (QD=32) : 7.232 MB/s [ 1765.7 IOPS]
    Random Write 4KB (QD=32) : 0.259 MB/s [ 63.2 IOPS]

    Test : 100 MB [H: 47.0% (14.0/29.8 GB)] (x3) <All 0xFF, 1Fill>
    Date : 2011/06/19 11:02:22
    OS : Windows 7 Home Premium Edition [6.1 Build 7600] (x64)

    -----------------------------------------------------------------------
    Another test report for patriot class 10 card by user fyyzer
    http://xdaforums.com/showpost.php?p=15704916&postcount=22

    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 19.856 MB/s
    Sequential Write : 17.332 MB/s
    Random Read 512KB : 18.983 MB/s
    Random Write 512KB : 0.724 MB/s
    Random Read 4KB (QD=1) : 3.780 MB/s [ 922.9 IOPS]
    Random Write 4KB (QD=1) : 0.006 MB/s [ 1.5 IOPS]
    Random Read 4KB (QD=32) : 3.896 MB/s [ 951.2 IOPS]
    Random Write 4KB (QD=32) : 0.006 MB/s [ 1.4 IOPS]

    Test : 1000 MB [G: 5.8% (1.8/30.9 GB)] (x9)
    Date : 2011/07/16 7:49:13
    OS : Windows 7 SP1 [6.1 Build 7601] (x64)


    ____________________________________________________________________

    ____________________________________________________________________


    SanDisk 8GB Class 6 for comparison, 2 years old.


    -----------------------------------------------------------------------
    CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
    Crystal Dew World : http://crystalmark.info/
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 21.241 MB/s
    Sequential Write : 17.626 MB/s
    Random Read 512KB : 20.846 MB/s
    Random Write 512KB : 4.629 MB/s
    Random Read 4KB (QD=1) : 5.356 MB/s [ 1307.5 IOPS]
    Random Write 4KB (QD=1) : 0.052 MB/s [ 12.7 IOPS]
    Random Read 4KB (QD=32) : 5.484 MB/s [ 1338.8 IOPS]
    Random Write 4KB (QD=32) : 0.058 MB/s [ 14.2 IOPS]

    Test : 100 MB [H: 89.2% (6939.2/7782.5 MB)] (x3)
    Date : 2011/06/19 0:47:33
    OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

    ____________________________________________________________________
    ____________________________________________________________________



    32GB Class 4 Sandisk.


    Tested results when I received it today and thought I would post the results in case anyone else is considering purchasing from the same source.

    -----------------------------------------------------------------------
    CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
    Crystal Dew World : http://crystalmark.info/
    -----------------------------------------------------------------------
    * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

    Sequential Read : 20.071 MB/s
    Sequential Write : 6.088 MB/s
    Random Read 512KB : 19.716 MB/s
    Random Write 512KB : 0.625 MB/s
    Random Read 4KB (QD=1) : 3.234 MB/s [ 789.5 IOPS]
    Random Write 4KB (QD=1) : 1.467 MB/s [ 358.2 IOPS]
    Random Read 4KB (QD=32) : 3.164 MB/s [ 772.4 IOPS]
    Random Write 4KB (QD=32) : 0.150 MB/s [ 36.5 IOPS]

    Test : 1000 MB [E: 1.9% (0.6/29.7 GB)] (x5)
    Date : 2011/06/27 19:34:44
    OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

    29.71gb Capacity

    SD Tools results:

    writing speed 6.2mb/s
    reading speed 21.7mb/s

    More testing of sandisk 32gb class 4 card

    http://xdaforums.com/showpost.php?p=16472035&postcount=65
    from user freeze888

    http://xdaforums.com/showthread.php?p=15269669
    from user Shudushi

    View attachment 656461 View attachment 656462

    From user cajunflavoredbob
    http://xdaforums.com/showpost.php?p=15713401&postcount=25

    Clipboard01-2.jpg
    [/QUOTE]


    ____________________________________________________________________
    ____________________________________________________________________

    Just adding somemore info on some the cards i have

    sandisk32gbclass4.png


    sandisk16gbclass2.png


    lexar32gbclass10.png





    ADAta sd card Thanks to jesus_c
    http://xdaforums.com/showpost.php?p=15700083&postcount=20

    http://twitpic.com/5q0ryp





    Test report for other class of cards

    1. Thanks to vicedens2002

    http://xdaforums.com/showpost.php?p=15700162&postcount=21

    - Samsung 8GB class 6
    - Sandisk 1GB
    - Windows drive 60GB Class 3072 - OOps i wish I had this in my phone ;-)


    FINALLY 64GB CARD
    http://www.geek.com/articles/mobile/kingmax-intros-worlds-first-64gb-microsd-card-20110526/
    15
    How to test your memory card


    1)Crystal bench mark for finding the random write speeds
    2) H2testw 1.4 which tests to see if your card has genuine capacity
    3) SD Formatter for SDHC This software formats all SD memory cards, SDHC memory cards

    Thanks to user Szczepanik
    http://xdaforums.com/showpost.php?p=15913944&postcount=45



    Samsung has recently announced a 32gb class10 card.
    The specs for speed looks very nice

    http://www.engadget.com/2011/06/30/samsung-announces-32gb-microsd-card-capable-of-12mbps-write-spee/
    7
    When I rang Technical Support at SanDisk to ask about cards, this is what they told me. The guy I spoke to seemed knowledgeable, but of course this info might be incomplete or maybe just his understanding of the situation...

    First up, "Mobile Ultra" and "Ultra" are the same card, the name difference was just for marketing purposes, to show people the card could be used in mobiles. However the plan backfired and people thought they couldn't use "Mobile Ultra" in their camera, so the name was dropped.

    To decipher the codes such as SDSDQUA-032G-U46A:

    SDSD=sd card

    Q =class 4 (black) available in 2,4,8,16,32GB
    QY=class 6 "Ultra" (red & grey) available in 4GB (8,16,32gb discontinued but still on sale)
    QU=?
    QUA=class 10 "Ultra" 8,16,32=SDHC 64=SDXC* (UHS-I = UHS class 1 = 10mb/s #)
    QUI=class 10 "Ultra" apparently "designed for cameras" and NOT the same card (black packaging)

    -000G=GB

    -U46=EU packaging@
    -A11=US packaging@
    -FFP=Amazon frustration free packaging@

    A=picture of android on package

    NOTES
    * Compatible devices only
    # If used in a non UHS-I compliant phone, it will revert to class 10
    @ If it doesn't have a code at the end, it's not covered by SanDisk warranty
    3
    Thank you for information :) .
    I dont like it :( , its sucks that higher class is not better in all ways.
    But then, why people here in xda keep saying that class4 is better than class6/10 in using applications, you say that it depends on random read speed. We see that random read speed is higher in class6
    class6
    Random Read 4KB (QD=1) : 5.356 MB/s [ 1307.5 IOPS]
    Random Read 4KB (QD=32) : 5.484 MB/s [ 1338.8 IOPS]
    vs.
    class4
    Random Read 4KB (QD=1) : 3.234 MB/s [ 789.5 IOPS]
    Random Read 4KB (QD=32) : 3.164 MB/s [ 772.4 IOPS]

    Card manufacturers sacrifice random speed in order to gain sequential speed boosts in their cards. This generally means that the random speeds get slower as the sequential speeds get higher. The speeds vary depending on the card reader, PC, and card manufacturer. There isn't just one card to rule them all. You have to find out for yourself which card is better for you.

    Random speeds are even more critical in WP7 devices, which need a very high random speed to use the cards properly. In Android and other operating systems, you need to decide what your primary use for the card is. If you are looking to take lots of HD video, pictures, or watch lots of movies on your device, then a higher class card is much better for that. If you mostly just play games or use apps, then a lower class card is better for you.

    As I mentioned, not all cards will give you the same results as others who have posted here. I use Class 4 SanDisk cards as I have a HD2 that I use for running WM, Android, or WP7 depending on how I feel at the time. Running WP7 at all requires that I have high random speeds, so I have to use a low class card anyway. Even on Android, I store most apps on my SD card, so a low class card is better here too. I rarely watch movies or even record video on it. My camera takes decent enough pictures at 5MP that a low class card doesn't slow it down any. Even on WM, that operating system is optimized for lower class cards, since that's what was available at the time.

    Anyway, there are 5 classes of cards from class 2 up to class 10. If you want one in the middle, then get a class 6. This is just going to give to low numbers in both categories, though, so I would suggest getting either a class 4 or class 10, depending on what you do the most.
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    How about android phones. Do they rely more on random than sequential?

    WP7 bonds the SD cards with the NAND memory in a sort of RAID 0 array. Because the memory acts as one single unit, rather than separate storage and internal memory environments, it needs a memory format with high random speeds to be able to run apps, cache data, and do other things that the internal NAND memory on other devices would normally handle.

    Android devices use the SD card as a memory card. You need to decide which class to get based on what you mainly use the card for. Running apps and games from the card would be better with a lower class card. Recording HD video, transferring files, and saving pictures will be faster with higher class cards.