[HD2 Android Q&A, Help & Troubleshooting and Genera] thivi:
Hi, nice thread, I was asking myself same question about SD cards because the one I use seems very slow...

Here are the results for 4 microSD cards :

- Noname 32 GB class 4

- Dane Elec 16 GB class 2

- Sandisk 8 GB class 4

- Kingston 2GB class ?

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

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

Sequential Read : 3.831 MB/s

Sequential Write : 3.317 MB/s

Random Read 512KB : 3.825 MB/s

Random Write 512KB : 0.656 MB/s

Random Read 4KB (QD=1) : 1.031 MB/s [ 251.8 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.4 IOPS]

Random Read 4KB (QD=32) : 1.079 MB/s [ 263.4 IOPS]

Random Write 4KB (QD=32) : 0.006 MB/s [ 1.5 IOPS]

Test : 1000 MB [J: 51.4% (15.4/29.9 GB)] (x5)

Date : 2011/04/30 22:11:52

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)

(NoName) 32GB class4

This is the SDcard I use, I have a dual boot with WM6.5 and Android on SD (Rafdroid 4.2). RafDroid SD is a super build but was quite laggy, I know why now, because my SD card is rubbish !

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

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 : 20.765 MB/s

Sequential Write : 5.914 MB/s

Random Read 512KB : 20.437 MB/s

Random Write 512KB : 0.968 MB/s

Random Read 4KB (QD=1) : 3.738 MB/s [ 912.5 IOPS]

Random Write 4KB (QD=1) : 0.016 MB/s [ 3.8 IOPS]

Random Read 4KB (QD=32) : 4.036 MB/s [ 985.2 IOPS]

Random Write 4KB (QD=32) : 0.014 MB/s [ 3.5 IOPS]

Test : 1000 MB [I: 71.5% (10.7/14.9 GB)] (x5)

Date : 2011/04/30 20:31:19

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)

DaneElec 16GB class2 (C16G JAPAN)

I guess I will delete some files and use this 16GB SD card instead of the previous 32 GB one ! Write results seem a bit slow though, but which result is the most important ???

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

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 : 14.505 MB/s

Sequential Write : 10.635 MB/s

Random Read 512KB : 14.474 MB/s

Random Write 512KB : 3.585 MB/s

Random Read 4KB (QD=1) : 2.336 MB/s [ 570.4 IOPS]

Random Write 4KB (QD=1) : 0.040 MB/s [ 9.7 IOPS]

Random Read 4KB (QD=32) : 2.315 MB/s [ 565.3 IOPS]

Random Write 4KB (QD=32) : 0.044 MB/s [ 10.8 IOPS]

Test : 100 MB [F: 81.8% (6353.1/7771.3 MB)] (x5)

Date : 2011/04/30 23:11:11

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)

SanDisk 8GB class4

Write results are better with the Sandisk...

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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 : 10.233 MB/s

Sequential Write : 5.555 MB/s

Random Read 512KB : 10.126 MB/s

Random Write 512KB : 1.144 MB/s

Random Read 4KB (QD=1) : 1.676 MB/s [ 409.3 IOPS]

Random Write 4KB (QD=1) : 0.010 MB/s [ 2.5 IOPS]

Random Read 4KB (QD=32) : 1.768 MB/s [ 431.7 IOPS]

Random Write 4KB (QD=32) : 0.017 MB/s [ 4.1 IOPS]

Test : 100 MB [F: 46.3% (867.6/1875.8 MB)] (x5)

Date : 2011/04/30 23:31:48

OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)

Kingston 2GB