yashsingh1/xdaforums huggingface dataset:
[HD2 Android Q&A, Help & Troubleshooting and Genera] gecata:
Some more tests:

Transcend 8gb class 6:

-----------------------------------------------------------------------

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 : 17.320 MB/s

Sequential Write : 9.620 MB/s

Random Read 512KB : 17.014 MB/s

Random Write 512KB : 2.199 MB/s

Random Read 4KB (QD=1) : 4.655 MB/s [ 1136.4 IOPS]

Random Write 4KB (QD=1) : 0.026 MB/s [ 6.2 IOPS]

Random Read 4KB (QD=32) : 4.673 MB/s [ 1140.8 IOPS]

Random Write 4KB (QD=32) : 0.028 MB/s [ 6.8 IOPS]

Test : 50 MB [J: 0.0% (0.0/7638.0 MB)] (x2)

Date : 2011/04/27 11:31:59

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)

------------------------------------------------------------------------

Transcend 8gb class 10:

-----------------------------------------------------------------------

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 : 18.923 MB/s

Sequential Write : 12.561 MB/s

Random Read 512KB : 18.896 MB/s

Random Write 512KB : 1.541 MB/s

Random Read 4KB (QD=1) : 3.993 MB/s [ 974.8 IOPS]

Random Write 4KB (QD=1) : 0.013 MB/s [ 3.3 IOPS]

Random Read 4KB (QD=32) : 4.112 MB/s [ 1003.8 IOPS]

Random Write 4KB (QD=32) : 0.013 MB/s [ 3.1 IOPS]

Test : 50 MB [J: 42.8% (3272.8/7639.0 MB)] (x2)

Date : 2011/04/27 11:40:07

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)
[HD2 Android Q&A, Help & Troubleshooting and Genera] gecata:
And test using HD2 as card reader.

Rom Energy Apr.23

Transcend 8gb class 6:

-----------------------------------------------------------------------

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 : 8.210 MB/s

Sequential Write : 5.087 MB/s

Random Read 512KB : 8.233 MB/s

Random Write 512KB : 1.882 MB/s

Random Read 4KB (QD=1) : 3.938 MB/s [ 961.4 IOPS]

Random Write 4KB (QD=1) : 0.026 MB/s [ 6.3 IOPS]

Random Read 4KB (QD=32) : 4.009 MB/s [ 978.7 IOPS]

Random Write 4KB (QD=32) : 0.025 MB/s [ 6.2 IOPS]

Test : 50 MB [K: 0.0% (0.1/7638.0 MB)] (x2)

Date : 2011/04/27 11:57:40

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)

Transcend 8gb class 10:

-----------------------------------------------------------------------

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 : 8.511 MB/s

Sequential Write : 5.823 MB/s

Random Read 512KB : 8.510 MB/s

Random Write 512KB : 1.617 MB/s

Random Read 4KB (QD=1) : 3.437 MB/s [ 839.2 IOPS]

Random Write 4KB (QD=1) : 0.013 MB/s [ 3.2 IOPS]

Random Read 4KB (QD=32) : 3.493 MB/s [ 852.8 IOPS]

Random Write 4KB (QD=32) : 0.011 MB/s [ 2.8 IOPS]

Test : 50 MB [K: 42.8% (3272.8/7639.0 MB)] (x2)

Date : 2011/04/27 11:50:15

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x86)
[HD2 Android Q&A, Help & Troubleshooting and Genera] yugoport:
Thanks a lot for the benchmarks, wich one works better in Android? The class 6?
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
Hi !

thanks for sharing ! well how desire hd rom goes on your hd2 with those memory card ? Do you have lag ?

Anyway as for my opionion I have seen the best results from benchmark from the patriot 16 gb class 10 and from A-data cards, the only problem with patriot is that they don't seem to work with android ( and it's huge problem for us !! )

Stil waiting to see a benchamrk for A-data class 10 16gb card micro sd card !!
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
so no one has an A-data class 10 16 gb micro sd ??
[HD2 Android Q&A, Help & Troubleshooting and Genera] axl30:
:confused:

Sandisk 8gb class 6:

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 : 19.832 MB/s

Sequential Write : 10.530 MB/s

Random Read 512KB : 19.478 MB/s

Random Write 512KB : 4.802 MB/s

Random Read 4KB (QD=1) : 3.781 MB/s [ 923.0 IOPS]

Random Write 4KB (QD=1) : 0.053 MB/s [ 12.9 IOPS]

Random Read 4KB (QD=32) : 4.013 MB/s [ 979.8 IOPS]

Random Write 4KB (QD=32) : 0.062 MB/s [ 15.2 IOPS]

Test : 50 MB [P: 94.3% (7341.0/7782.5 MB)] (x2)

Date : 2011/04/28 14:42:33

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

next sd ...adata 16 gb class 10 :D
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
thanks you !! Also you sandisk class 6 is not bad at all !!

By the way how android ( desire HD ) runs on you sandisk class 6 ?
[HD2 Android Q&A, Help & Troubleshooting and Genera] chapyy:
Sequential Read : 10.49 MB/s

Sequential Write : 5.457 MB/s

Random Read 512KB : 10.16 MB/s

Random Write 512KB : 0.690 MB/s

Random Read 4KB (QD=1) : 2.338 MB/s

Random Write 4KB (QD=1) : 0.717 MB/s

Random Read 4KB (QD=32) : 2.393 MB/s

Random Write 4KB (QD=32) : 0.470 MB/s

Test : 500 MB (14.9gb) (x5)

Date : 2011/04/29 02.45 am

OS : Windows Vista Home Premium Edition SP2 [6.0 Build 6002] (x86)

16gb class4 SanDisk

-----------------------------------------------------------------------

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 : 10.51 MB/s

Sequential Write : 6.499 MB/s

Random Read 512KB : 10.28 MB/s

Random Write 512KB : 1.711 MB/s

Random Read 4KB (QD=1) : 2.730 MB/s

Random Write 4KB (QD=1) : 0.548 MB/s

Random Read 4KB (QD=32) : 2.844 MB/s

Random Write 4KB (QD=32) : 0.544 MB/s

Test : 50 MB (14.9gb) (x5)

16gb class4 SanDisk
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
One of the best result regarding Random write on 4KB !
[HD2 Android Q&A, Help & Troubleshooting and Genera] yugoport:
Indeed,i'm waiting to see more benchmarks, if the results of the scandisk cards shows the same good values for random writing i'll buy one..
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
anyway be carefull as I don't know if it's most important the random writing or the random read, as for my personal opinion I think that random read it's more important. Also I have heard that A-DATA class 10 are the best microsd around, but still we need a test !

P.S. the thread has been moved so search it inside "HD2 Android Q&A and General" !!!
[HD2 Android Q&A, Help & Troubleshooting and Genera] khangozzy:
This is the results from my card: Using AmeriCanAndroid SD 27 Apr.

-----------------------------------------------------------------------

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 : 19.517 MB/s

Sequential Write : 9.161 MB/s

Random Read 512KB : 19.487 MB/s

Random Write 512KB : 0.839 MB/s

Random Read 4KB (QD=1) : 4.346 MB/s [ 1061.0 IOPS]

Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]

Random Read 4KB (QD=32) : 4.396 MB/s [ 1073.1 IOPS]

Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]

Test : 1000 MB [E: 49.1% (3751.0/7640.1 MB)] (x5)

Date : 2011/05/01 0:16:00

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Kingston 8G Class 4

I am looking for a new 16G, anyone here using Transcend 16G class 2 or class 4 can post the test pls.!
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
weel thanks for your benchmark, then I suggest you to use the sandisk 8 gb or the DaneElec 16GB class2, anyway try to use this build and not the rafpigna one : http://xdaforums.com/showthread.php?t=954030 it's the rom from the desire HD but it's very very fast, I can tell you for personal experience because my microsd is slow and the rom is fast anyway !
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
Your results are no bad at all, like I have already said I don't know which result are more importat ( if read or write speed ), I personally think that read speed and access time are the 2 most important data but I'm not an expert.

Actually If I remember well you should find result from the transcend some pages behind in this discussion, also I think that A-DATA should be better.

I suggest you to try this ROM with your acutally memory because I think that it's super fast ! http://xdaforums.com/showthread.php?t=954030
[HD2 Android Q&A, Help & Troubleshooting and Genera] khangozzy:
I am using ACA with this card without any problem, even didn't re-format when start using Android SD. Will try the ROM you suggested later.
[HD2 Android Q&A, Help & Troubleshooting and Genera] khangozzy:
Update with my new Transcend 16G class 2

-----------------------------------------------------------------------

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 : 10.866 MB/s

Sequential Write : 6.061 MB/s

Random Read 512KB : 10.700 MB/s

Random Write 512KB : 0.660 MB/s

Random Read 4KB (QD=1) : 2.620 MB/s [ 639.7 IOPS]

Random Write 4KB (QD=1) : 1.502 MB/s [ 366.7 IOPS]

Random Read 4KB (QD=32) : 2.472 MB/s [ 603.6 IOPS]

Random Write 4KB (QD=32) : 0.140 MB/s [ 34.2 IOPS]

Test : 1000 MB [E: 0.0% (0.0/14.8 GB)] (x5)

Date : 2011/05/01 17:26:31

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Transcend 16G Class 2
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
by the way be careful in doing benchmard because here I see some users do the test of the 50 mb, some other of the 500 mb and also the 1000 mb, this bring different result, because as far as I know the test of the 50 mb or 500 mb is more difficoult and so we cannot compare test of the 1000 mb with the others !
[HD2 Android Q&A, Help & Troubleshooting and Genera] yugoport:
Wow, this card has a huge random write values compared to the other tests I saw, and in my opinion those are the most important values to run an OS from the SD, I'm using ACA for the last month, but I think the ultimate test for SD cards are the DHD roms with sense, I remember that my Kingston 16gb class 4 ( it has small random write values) lagged a lot in that card, have you ever tried DHD roms in that card? With those random values they should work well in that card..
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
if you refer to the transcendt class 2, the test has been done on the 1000 mb and this is why random write values are so high, anyway I don't know what to think ..honestly I don't believe that when the system need to lanch apps or use sense it need to write, I think that it need to read and to have fast access to the data, what you think ?
[HD2 Android Q&A, Help & Troubleshooting and Genera] khangozzy:
I use the default settings of CrystalDiskMark. Don't know which one is the best Test Size. The app's manual didn't give much info, I confused abt this parameter from the manual:

Test Size

50MB, 100MB, 500MB, 1000MB, 2000MB and 4000MB.

Default value is 1000MB. But it may be too large for low speed storage (USB memory etc...), so you should choose small size.

Anyone can figure out the parameters and settings we need to test to find out which is the most important specs to run Android SD!!!???
[HD2 Android Q&A, Help & Troubleshooting and Genera] yugoport:
I remember that I made 1000 mb tests and 50 mb/s tests and results weren't very different, but I will test again one card with 1000 and 50 mb/s tests to see if there is any difference..

We are getting somewhere, I think that you are right about the importance of random read, but we saw that all cards have at least 1 mb/s of random reading, and I think that this value is enough, in other hand, the random writing is much much lower, we are talking about values that are 200 times smaller, and our worst lags were when installing apps from the market, in that moment the system is writing, but we are getting somewhere, we just need that the people that are testing their sd cards to tell us wich cards are working well and what roms are they using..

Nice initiative from you light_n_roses, to create this thread, we finally might be able to know what SD cards we can use without spending our money away..
[HD2 Android Q&A, Help & Troubleshooting and Genera] khangozzy:
Update Transcend 16G class 2 with Test Size: 500, 100 and 50 MB

-----------------------------------------------------------------------

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 : 8.711 MB/s

Sequential Write : 6.239 MB/s

Random Read 512KB : 8.606 MB/s

Random Write 512KB : 0.713 MB/s

Random Read 4KB (QD=1) : 2.382 MB/s [ 581.5 IOPS]

Random Write 4KB (QD=1) : 1.382 MB/s [ 337.4 IOPS]

Random Read 4KB (QD=32) : 2.121 MB/s [ 517.9 IOPS]

Random Write 4KB (QD=32) : 0.219 MB/s [ 53.5 IOPS]

Test : 500 MB [F: 33.1% (4.9/14.8 GB)] (x5)

Date : 2011/05/01 20:41:15

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Transcend 16B class 2

-----------------------------------------------------------------------

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 : 8.714 MB/s

Sequential Write : 5.890 MB/s

Random Read 512KB : 8.630 MB/s

Random Write 512KB : 0.862 MB/s

Random Read 4KB (QD=1) : 2.745 MB/s [ 670.1 IOPS]

Random Write 4KB (QD=1) : 0.446 MB/s [ 109.0 IOPS]

Random Read 4KB (QD=32) : 2.347 MB/s [ 573.1 IOPS]

Random Write 4KB (QD=32) : 0.296 MB/s [ 72.2 IOPS]

Test : 100 MB [F: 33.1% (4.9/14.8 GB)] (x5)

Date : 2011/05/01 20:50:37

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Transcend 16B class 2

-----------------------------------------------------------------------

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 : 8.713 MB/s

Sequential Write : 6.593 MB/s

Random Read 512KB : 8.636 MB/s

Random Write 512KB : 1.702 MB/s

Random Read 4KB (QD=1) : 2.787 MB/s [ 680.4 IOPS]

Random Write 4KB (QD=1) : 0.272 MB/s [ 66.3 IOPS]

Random Read 4KB (QD=32) : 2.489 MB/s [ 607.8 IOPS]

Random Write 4KB (QD=32) : 0.351 MB/s [ 85.7 IOPS]

Test : 50 MB [F: 33.1% (4.9/14.8 GB)] (x5)

Date : 2011/05/01 20:56:55

OS : Windows 7 SP1 [6.1 Build 7601] (x86)

Transcend 16B class 2
[HD2 Android Q&A, Help & Troubleshooting and Genera] yugoport:
Khangozzy , Thanks a lot for your tests, light_n_roses was right, different results, although even the last one that has a smaller random write values is very good compared to others that I saw.. Thanks a lot for your contribution.
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
I agreed;

FROM NOW ON REPORT YOUR BENCHMARK TOGHETHER WITH THE INFORMATION ABOUT WHICH ROM YOU HAVE INSTALLED AND HOW IT WORK ( LAGS ECC. ) PERSONALLY I SUGGEST TO TRY WITH THIS ONE : http://xdaforums.com/showthread.php?t=954030

I have modified the first page and the title !
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
is there anyone who have an A-data or A PNY class 10 card ?

Remember to follow the guide on first page !! !
[HD2 Android Q&A, Help & Troubleshooting and Genera] TheTodFather:
you guys if you are trying to run an OS from your sd then remember the higher the class generally the crapper your OS experience is going to be. Sequential times DO NOT MATTER. ITs the random read and writes. I have a sandisk 16gb class 2. You always want to go with sandisk. We have a huge thread in nookcolor general about this. It is proven that sandisk will have consistent speeds. Specially if you are gonna be running an os on it. The sandisk I'm using is pretty much better then any internal emmc. **** is blazingl...

Ok this is what you need to be looking for.

4k Qd32 from crystaldiskmark 2.240 (read) 1.140 (write) MB

sequential means nothing when you are running an os from it!!!

This is what your system will be running! Check out our thread out in nookcolor.
[HD2 Android Q&A, Help & Troubleshooting and Genera] TheTodFather:
If you think class 10 is good your on crack. Compare those numbers i provided. Class 10 are gonna really suck. 100 x slower!!!! .012 ....lol
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
Thanks for you information, could you please link me this thread ?
[HD2 Android Q&A, Help & Troubleshooting and Genera] axl30:
-----------------------------------------------------------------------

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 : 19.622 MB/s

Sequential Write : 10.492 MB/s

Random Read 512KB : 19.469 MB/s

Random Write 512KB : 1.359 MB/s

Random Read 4KB (QD=1) : 4.495 MB/s [ 1097.3 IOPS]

Random Write 4KB (QD=1) : 0.011 MB/s [ 2.6 IOPS]

Random Read 4KB (QD=32) : 4.534 MB/s [ 1106.9 IOPS]

Random Write 4KB (QD=32) : 0.021 MB/s [ 5.2 IOPS]

Test : 50 MB [P: 0.0% (0.0/15.0 GB)] (x1)

Date : 2011/05/17 13:18:34

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

ADATA 16gb class 10

se vi interessa la vendo..appena comprata
[HD2 Android Q&A, Help & Troubleshooting and Genera] axl30:
-----------------------------------------------------------------------

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 : 19.780 MB/s

Sequential Write : 5.583 MB/s

Random Read 512KB : 19.430 MB/s

Random Write 512KB : 2.093 MB/s

Random Read 4KB (QD=1) : 3.010 MB/s [ 734.9 IOPS]

Random Write 4KB (QD=1) : 1.210 MB/s [ 295.3 IOPS]

Random Read 4KB (QD=32) : 3.107 MB/s [ 758.6 IOPS]

Random Write 4KB (QD=32) : 1.243 MB/s [ 303.5 IOPS]

Test : 50 MB [P: 0.0% (0.0/14.8 GB)] (x3)

Date : 2011/05/19 20:30:03

OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)

Sandisk ultramobile 16gb Class 4 :D
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
Hi Candlemass !

As far as I know the best results cames from the sandisk class 2 and 4 , all the rest are not good for this.
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
well my sandisk class 4 16gb microsd card has arrived and I think that I can put the word end to this reaserch, performance are years better that there was with my old memroy card also the random write in the crystal mark is close to the unity so it's a very relevant data as all micro sd with value near to zero in ramdom write perform very poor with android !
[HD2 Android Q&A, Help & Troubleshooting and Genera] wc326:
I just bought a Class 10 32GB card.

I am not sure what to expect, is this a good result at all?????

-----------------------------------------------------------------------

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 : 19.485 MB/s

Sequential Write : 11.398 MB/s

Random Read 512KB : 19.445 MB/s

Random Write 512KB : 0.948 MB/s

Random Read 4KB (QD=1) : 4.368 MB/s [ 1066.3 IOPS]

Random Write 4KB (QD=1) : 0.013 MB/s [ 3.2 IOPS]

Random Read 4KB (QD=32) : 4.425 MB/s [ 1080.3 IOPS]

Random Write 4KB (QD=32) : 0.021 MB/s [ 5.2 IOPS]

Test : 50 MB [P: 32.8% (9.8/29.8 GB)] (x1)

Date : 2011/05/24 20:36:54

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x64)
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
no because your results here : " Random Write 4KB (QD=1) : 0.013 MB/s [ 3.2 IOPS] " and expecially here : "Random Write 4KB (QD=32) : 0.021 MB/s [ 5.2 IOPS] " are very poor .

This is the typical results that can be obtained with a class 10 card...you need a class 2 or 4 ( sandisk ) to have a responsive android system on you SD card.
[HD2 Android Q&A, Help & Troubleshooting and Genera] wc326:
maybe i am on a wrong thread, but i only found this thread about sdcard in xda.

i do not use HD2 htc, i have lG 2x. so this sd card does not use for the android os at all. I only use it for Gameloft data storage and some mp3 music.

Other SYstem file will stay on the phone internal storage .

so will this class 10 sd card affect my phone in anyway??
[HD2 Android Q&A, Help & Troubleshooting and Genera] light_n_roses:
well you don't have to run an operative system from you memory card so not a big deal, also with class 10 you have better sequeltial speed so you should be fine..
[HD2 Android Q&A, Help & Troubleshooting and Genera] ritejbisaria:
nice helpful posts thnak you
[HD2 Android Q&A, Help & Troubleshooting and Genera] wc326:
thank you man.^^
[HD2 Android Q&A, Help & Troubleshooting and Genera] Qnkel:
Sandisk 16gb microSD class 4

per HDTune:

Average speed: 14MB/s

Access Time: 1.3ms
[HD2 Android Q&A, Help & Troubleshooting and Genera] kcteun:
transcend 4gb class 2

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

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

Sequential Read : 18.778 MB/s

Sequential Write : 6.626 MB/s

Random Read 512KB : 18.390 MB/s

Random Write 512KB : 1.614 MB/s

Random Read 4KB (QD=1) : 2.926 MB/s [ 714.3 IOPS]

Random Write 4KB (QD=1) : 1.266 MB/s [ 309.1 IOPS]

Random Read 4KB (QD=32) : 2.757 MB/s [ 673.0 IOPS]

Random Write 4KB (QD=32) : 1.116 MB/s [ 272.5 IOPS]

Test : 50 MB [F: 0.0% (0.0/3773.5 MB)] (x5)

Date : 2011/12/14 9:51:16

OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

I am preparing to run Cyanogenmod 7 on Nook Color and was testing the cards I had. This was by far the best.
[HD2 Android Q&A, Help & Troubleshooting and Genera] Chris Kerry:
Heard that benchmarks can't be really trusted
[HD2 Android Q&A, Help & Troubleshooting and Genera] davidjanda:
helpfull thread thank!