Higher class cards have high sequential speeds, but extremely low random speeds. Random speeds are better for application performance. For more information, please scan through the thread.
It's personal preference as to whether you want high sequential speeds (higher class) or higher random speeds (lower class).
That's up to you. I can't tell you how you use your device. You have to decide which one you need more.
Ok i ve re-run the test for the Patriot 32GB CLASS 10 this time from my card reader instead of the usb adapter.
Here are my results
Did the test also for my Sandisk 8GB Class 4.
I dont see a huge difference with this class 4 regarding low write speeds on 4K
i could say its more like deciding if you want higher 4K read speeds or higher 4K write speeds. Patriot 4K write sucks but read is good and better than Sandisk class 4.
Can somebody tell me the difference between 4K and 4K QD32?
Here are my results
Did the test also for my Sandisk 8GB Class 4.
I dont see a huge difference with this class 4 regarding low write speeds on 4K
i could say its more like deciding if you want higher 4K read speeds or higher 4K write speeds. Patriot 4K write sucks but read is good and better than Sandisk class 4.
Can somebody tell me the difference between 4K and 4K QD32?
Attachments
Last edited:
4K are the random speeds.
Also, you should have formatted the Class 4 before testing. Test results are not accurate when the card is loaded like yours is.
Hi all,
what's it like when you stick one of those cards in your Android full of music? I have an iPod Classic 160GB and now I'd like a bigger screen and touch for easier use. But I've heard terrible things about these SD cards in Android phones. I don't care about screenshots with big numbers,
-what is it like in practical use?
-Does music transfer quickly?
-When you de-tach your phone does it freeze while the SD loads? (some crappy mp3 players do).
-What happens when you load your music player, does it freeze, does it freeze the first time after music transfer or ever time, how long does it freeze?
-Do you have to format your SD card because of normal phone use? How often?
-How do you find out how fast your phone can read the SD?
That's all I care about. I have a feeling the only way I'll find out is by spending a lot of money, getting angry and buying another iPod. The Touch is waaaaay too expensive in my view, I'm not paying for Apple's champaign parties with my money. 32-64GB is expensive, it's the 8GB people who get cheap devices not us audio lovers.
what's it like when you stick one of those cards in your Android full of music? I have an iPod Classic 160GB and now I'd like a bigger screen and touch for easier use. But I've heard terrible things about these SD cards in Android phones. I don't care about screenshots with big numbers,
-what is it like in practical use?
-Does music transfer quickly?
-When you de-tach your phone does it freeze while the SD loads? (some crappy mp3 players do).
-What happens when you load your music player, does it freeze, does it freeze the first time after music transfer or ever time, how long does it freeze?
-Do you have to format your SD card because of normal phone use? How often?
-How do you find out how fast your phone can read the SD?
That's all I care about. I have a feeling the only way I'll find out is by spending a lot of money, getting angry and buying another iPod. The Touch is waaaaay too expensive in my view, I'm not paying for Apple's champaign parties with my money. 32-64GB is expensive, it's the 8GB people who get cheap devices not us audio lovers.
The big numbers are the only things relevant to this thread.
Use of what? An SD card? They aren't much different than my iPod. They just holds less music. Use of them is dependent on the device you use it with.
This isn't really up to the card unless you take it out of the device to transfer content. It's really up to your PC's ability to keep up in that case. Again, not much different than transferring music to my iPod.
This is dependent on the device you are using, not the card. I've never heard of this except in the crappy MP3 Players. It's always best to eject the device first, however it shouldn't freeze anything.
Again, this has nothing to do with the card, but with the device you are looking to get.
Yet again, this is up to the device you use on how crappy it constructs a file system. Nothing to do with the card at all.
Do the test we've been doing but with the card mounted in the device. There are also some SD benchmark apps in the Android Market.
Only one of your questions is dependent on the SD card. All of the other ones depend on the device you use for performance. Your brain isn't much good on its own anymore than the SD card is without a device to use it in.
May I have a question, which class of SDCard that suitable for my SGS2 for multimedia purpose, i.e. HD movie...?
Your advise is appreaciated
Your advise is appreaciated
Get which ever card allows you to search a thread before asking a question that's been answered several times before.
Hi, there are at least two considerations I believe. The first, regarding SD class for a HD movie, I found a few useful threads including this one:
http://xdaforums.com/showthread.php?t=1384247
Here, a number of people who've tested various classes say higher classes such as class 10 has poor performance in some ways and that class 4 actually performed better. I would also ask this question in the section for each phone, there will definitely be people who've bought cards that can tell you about their experience.
The second consideration is that each phone has specific SD card read speeds. This information I'm finding hard to find. Again, the SGS2 thread may have someone who knows. I've been doing the same with my own phone. The SGS2 is clearly a high-performance phone so I doubt you'll be disappointed but it's worth finding out anyway!
Basically, having a great SD but poor phone read speed or vice versa negatively affects the other.
Good luck!
here is the result for my Sandisk Class4 32GB.....
*decided to move from Patriot Class10 16GB to Sandisk Class4 32GB due to the 4k & 4kQD32 write result.
*decided to move from Patriot Class10 16GB to Sandisk Class4 32GB due to the 4k & 4kQD32 write result.
Here are my results for my Gigastone 32gig class 4 . Tested directly though micro sd port.
Patriot LX Series 32GB microSDHC Class 10 Card - PSF32GMCSDHC10
So I recently bought the Patriot LX Series 32GB microSDHC Class 10 Card which was just $40 at a store. The Model: PSF32GMCSDHC10
Here's the initial run by SD Tools, the Android App, this was the best out of the 10 tests.
Here's the CrystalDiskMark Test using Windows 7 and a USB Card Reader
This is a single test using 500MB
Test Stats:
-----------------------------------------------------------------------
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 : 19.894 MB/s
Sequential Write : 10.710 MB/s
Random Read 512KB : 19.517 MB/s
Random Write 512KB : 0.855 MB/s
Random Read 4KB (QD=1) : 3.675 MB/s [ 897.1 IOPS]
Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]
Random Read 4KB (QD=32) : 3.658 MB/s [ 893.0 IOPS]
Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]
Test : 500 MB [L: 0.0% (0.0/29.8 GB)] (x1)
Date : 2012/04/24 15:54:43
OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)
This is a single test using 4000MB
Test Stats:
-----------------------------------------------------------------------
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 : 19.793 MB/s
Sequential Write : 9.811 MB/s
Random Read 512KB : 19.460 MB/s
Random Write 512KB : 0.855 MB/s
Random Read 4KB (QD=1) : 3.468 MB/s [ 846.7 IOPS]
Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]
Random Read 4KB (QD=32) : 4.044 MB/s [ 987.3 IOPS]
Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]
Test : 4000 MB [L: 0.0% (0.0/29.8 GB)] (x1)
Date : 2012/04/24 16:31:50
OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)
General Performance Experience Review: Although the benchmarks for random read and write were horrible, when I stared running apps such as 3D games, the speed of the loading was much faster. What would usually take a minute to load would now only take 20 seconds. On average, I'm getting faster loading times with games raging from twice as fast to six times as fast. So yeah, higher class cards load large games and stuff faster. The speed of using EverNote and opening the notes were the same, everything else was either normal, or slightly faster (the apps that run off the SD card).
Loaded Games include:
Dungeon Hunter 2 (6x)
Modern Combat 3 (but during actual gameplay, it lags) (6x)
MineCraft: Pocket Edition (4x)
Angry Birds Space (4x)
Assasin's Creed HD (4x)
Cytus (6x)
Dead Space (4x)
CS Portable (6x)
So TL;DR: This Class 10 card is working fine for me in terms of actual experience.
Compared to the below 32GB SanDisk Class 4 card, this Patriot card is better for reading and writing, not so much for Random Reading and Writing (It sucks).
So I recently bought the Patriot LX Series 32GB microSDHC Class 10 Card which was just $40 at a store. The Model: PSF32GMCSDHC10
Here's the initial run by SD Tools, the Android App, this was the best out of the 10 tests.
Here's the CrystalDiskMark Test using Windows 7 and a USB Card Reader
This is a single test using 500MB
Test Stats:
-----------------------------------------------------------------------
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 : 19.894 MB/s
Sequential Write : 10.710 MB/s
Random Read 512KB : 19.517 MB/s
Random Write 512KB : 0.855 MB/s
Random Read 4KB (QD=1) : 3.675 MB/s [ 897.1 IOPS]
Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]
Random Read 4KB (QD=32) : 3.658 MB/s [ 893.0 IOPS]
Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]
Test : 500 MB [L: 0.0% (0.0/29.8 GB)] (x1)
Date : 2012/04/24 15:54:43
OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)
This is a single test using 4000MB
Test Stats:
-----------------------------------------------------------------------
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 : 19.793 MB/s
Sequential Write : 9.811 MB/s
Random Read 512KB : 19.460 MB/s
Random Write 512KB : 0.855 MB/s
Random Read 4KB (QD=1) : 3.468 MB/s [ 846.7 IOPS]
Random Write 4KB (QD=1) : 0.008 MB/s [ 2.0 IOPS]
Random Read 4KB (QD=32) : 4.044 MB/s [ 987.3 IOPS]
Random Write 4KB (QD=32) : 0.008 MB/s [ 2.0 IOPS]
Test : 4000 MB [L: 0.0% (0.0/29.8 GB)] (x1)
Date : 2012/04/24 16:31:50
OS : Windows 7 Ultimate Edition [6.1 Build 7600] (x86)
General Performance Experience Review: Although the benchmarks for random read and write were horrible, when I stared running apps such as 3D games, the speed of the loading was much faster. What would usually take a minute to load would now only take 20 seconds. On average, I'm getting faster loading times with games raging from twice as fast to six times as fast. So yeah, higher class cards load large games and stuff faster. The speed of using EverNote and opening the notes were the same, everything else was either normal, or slightly faster (the apps that run off the SD card).
Loaded Games include:
Dungeon Hunter 2 (6x)
Modern Combat 3 (but during actual gameplay, it lags) (6x)
MineCraft: Pocket Edition (4x)
Angry Birds Space (4x)
Assasin's Creed HD (4x)
Cytus (6x)
Dead Space (4x)
CS Portable (6x)
So TL;DR: This Class 10 card is working fine for me in terms of actual experience.
Compared to the below 32GB SanDisk Class 4 card, this Patriot card is better for reading and writing, not so much for Random Reading and Writing (It sucks).
Last edited:
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91Lots 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
( 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
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
____________________________________________________________________
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
[/QUOTE]
____________________________________________________________________
____________________________________________________________________
Just adding somemore info on some the cards i have
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-20110526/15How 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/7When 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 warranty3Thank 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.3
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.
