Random Read 4KB (QD=1) : 4.575 MB/s [ 1116.8 IOPS]
Random Write 4KB (QD=1) : 1.847 MB/s [ 451.0 IOPS]
Random Read 4KB (QD=32) : 4.991 MB/s [ 1218.5 IOPS]
Random Write 4KB (QD=32) : 1.956 MB/s [ 477.5 IOPS]
Random Read 4KB (QD=32) : 4.453 MB/s [ 1087.1 IOPS]
Random Write 4KB (QD=32) : 2.137 MB/s [ 521.8 IOPS]
Random Read 4KB (QD=1) : 8.184 MB/s [ 1998.0 IOPS]
Random Write 4KB (QD=1) : 1.533 MB/s [ 374.4 IOPS]
Random Read 4KB (QD=32) : [COLOR="Red"]8.187 MB/s[/COLOR] [ 1998.8 IOPS]
Random Write 4KB (QD=32) : [COLOR="Blue"]2.012 MB/s[/COLOR] [ 491.2 IOPS]
test parameters: 5/50MB
Random Read 4KB (QD=1) : 6.015 MB/s
Random Write 4KB (QD=1) : 2.274 MB/s
Random Read 4KB (QD=32) : [COLOR="Blue"]6.515 MB/s[/COLOR]
Random Write 4KB (QD=32) : [COLOR="Red"]2.338 MB/s[/COLOR]
test parameters: 5/100MB
Random Read 4KB (QD=1) : 5.589 MB/s
Random Write 4KB (QD=1) : 1.328 MB/s
Random Read 4KB (QD=32) : 5.835 MB/s
Random Write 4KB (QD=32) : 1.321 MB/s
test parameters: 5/500MB
Random Read 4KB (QD=1) : 4.570 MB/s
Random Write 4KB (QD=1) : 0.739 MB/s
Random Read 4KB (QD=32) : 4.948 MB/s
Random Write 4KB (QD=32) : 0.728 MB/s
-----------------------------------------------------------------------
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 38.202 MB/s
Sequential Write : 19.299 MB/s
Random Read 512KB : 35.419 MB/s
Random Write 512KB : 22.591 MB/s
Random Read 4KB (QD=1) : 3.645 MB/s [ 889.9 IOPS]
Random Write 4KB (QD=1) : 0.788 MB/s [ 192.5 IOPS]
Random Read 4KB (QD=32) : 3.963 MB/s [ 967.5 IOPS]
Random Write 4KB (QD=32) : 0.825 MB/s [ 201.5 IOPS]
Test : 500 MB [D: 0.0% (0.0/29.3 GB)] (x5)
Date : 2014/08/21 14:07:32
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
-----------------------------------------------------------------------
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World :
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 38.452 MB/s
Sequential Write : 23.707 MB/s
Random Read 512KB : 35.695 MB/s
Random Write 512KB : 22.424 MB/s
Random Read 4KB (QD=1) : 3.984 MB/s [ 972.7 IOPS]
Random Write 4KB (QD=1) : 0.957 MB/s [ 233.7 IOPS]
Random Read 4KB (QD=32) : 4.395 MB/s [ 1073.1 IOPS]
Random Write 4KB (QD=32) : 0.954 MB/s [ 232.8 IOPS]
Test : 100 MB [D: 0.0% (0.0/29.3 GB)] (x5)
Date : 2014/08/21 14:18:06
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
Samsung EVO 32GB Class 10 (UHS-1) (WMT $27), model MB-MP32D, model code MP-MP32DAM/WMT
I just bought this card and it passes Windows 7 Readyboost tests. Here are some CrystalDiskMark runs.
Code:----------------------------------------------------------------------- CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo Crystal Dew World ----------------------------------------------------------------------- * MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s] Sequential Read : 38.202 MB/s Sequential Write : 19.299 MB/s Random Read 512KB : 35.419 MB/s Random Write 512KB : 22.591 MB/s Random Read 4KB (QD=1) : 3.645 MB/s [ 889.9 IOPS] Random Write 4KB (QD=1) : 0.788 MB/s [ 192.5 IOPS] Random Read 4KB (QD=32) : 3.963 MB/s [ 967.5 IOPS] Random Write 4KB (QD=32) : 0.825 MB/s [ 201.5 IOPS] Test : 500 MB [D: 0.0% (0.0/29.3 GB)] (x5) Date : 2014/08/21 14:07:32 OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
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.
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]
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]
How about android phones. Do they rely more on random than sequential?