Database Develop

What is your SD card benchmark?

I'm wondering if my 8gb class 6 Transcend SD card is slow, or my phone is.
When using J Benchmark I get like 1.4 Megabyte/s write and 2.6 Megabyte/s read.
This is slow for a class 6 card.
Could some of you run J Benchmark and write their results. Please also write which class card you have (and maybe which brand).
Thanks in advance.

I got 1.75 and 2.06 on a Sandisk 16gb class 2.

I have a class 2 16GB Sandisk and I got 2.03mb write & 2.66mb read. Ive been looking to go up to a class 4 or 6 32GB but I'm wondering if my N1 would use the extra speed??
Edit: tested internal NAND and got 0.44mb for write and 2.43mb for read.. is that normal??

100MB File size
8KB Buffer
Write: 3.36 MB/s
Read: 6.99 MB/s
8 Gig Class 6 MicroSD Card

McFroger3 said:
100MB File size
8KB Buffer
Write: 3.36 MB/s
Read: 6.99 MB/s
8 Gig Class 6 MicroSD Card
Click to expand...
Click to collapse
Which brand is that?

OP, heres the qrcode for JBenchmark
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http://www.androidzoom.com/android_applications/tools/j-benchmark-test-for-developer_gqzx.html
For my RiData 16GB Class 6
Data size: 10MB
buffer size: 2KB
Write: 1.66 MB/s
Read: 2.74 MB/s
buffer size: 4KB
Write: 2.25 MB/s
Read: 5.26 MB/s

Sandisk 16gb class 2

I must have a lucky card I have a Polaroid 16gb class 2 from frys for $18 after rebate
10MB, 2k cache
Write: 2.38 | 2.36 | 2.33 -- Avg: 2.36 MB/s
Read: 3.44 | 3.15 | 3.20 -- Avg: 3.26 MB/s
10MB, 4k cache
Write: 4.33 | 4.02 | 4.23 -- Avg: 4.19 MB/s
Read: 6.39 | 5.49 | 6.25 -- Avg: 6.04 MB/s
10MB, 8k cache
Write: 7.62 | 6.60 | 6.99 -- Avg: 7.07 MB/s
Read: 12.42 | 11.22 | 11.10 -- Avg: 11.58 MB/s
I did some more tests with larger files and the speeds are the same.

Thanks for your benchmarks. It seems like my card is very slow for a class 6 card.
I'll probably get another one and hope for better results.

damanrico said:
Thanks for your benchmarks. It seems like my card is very slow for a class 6 card.
I'll probably get another one and hope for better results.
Click to expand...
Click to collapse
I thought I remember reading an article awhile back that many of these cards aren't what they claim to be for class and speed.
How do we really know? It is just a manfucturers claims, what law says they need to prove the actual class and throughput? And if there is a law, who is going to challenge them?

How do you change the buffer size for an SD card - or is this just a feature of whatever benchmark program you use?

gf_gollum said:
How do you change the buffer size for an SD card - or is this just a feature of whatever benchmark program you use?
Click to expand...
Click to collapse
Feature of the benchmark program.

sandisk 8gb class 2 1.68/2.68

If you test at 2kb then it's really slow. The internal nand is even slower. Test at least 4kb to get a better picture or before writing off your sd card
Sent from my Nexus One using XDA App

ChronoReverse said:
If you test at 2kb then it's really slow. The internal nand is even slower. Test at least 4kb to get a better picture or before writing off your sd card
Sent from my Nexus One using XDA App
Click to expand...
Click to collapse
True, but for me I get the same results for copying files to my SD card from my PC, as I get using the 2kb buffer size setting.
What kind of speeds do you get when transfering a file to SD from PC?

damanrico said:
True, but for me I get the same results for copying files to my SD card from my PC, as I get using the 2kb buffer size setting.
What kind of speeds do you get when transfering a file to SD from PC?
Click to expand...
Click to collapse
I get the speed for 4kB (about 2MB/s) as opposed to the dismal score for 2kB. Wish I'd get the 8kB speeds (almost 6MB/s which is what my class 6 is supposed to do). One thing to note is supposedly Froyo broke something and made transferring over USB slower.
I've noticed that copying files over wifi is somewhat quicker than using the direct USB connection. A 223MB file takes about than 20 second more over USB.

damanrico said:
I'm wondering if my 8gb class 6 Transcend SD card is slow, or my phone is.
When using J Benchmark I get like 1.4 Megabyte/s write and 2.6 Megabyte/s read.
This is slow for a class 6 card.
Could some of you run J Benchmark and write their results. Please also write which class card you have (and maybe which brand).
Thanks in advance.
Click to expand...
Click to collapse
as with everyone...i get slower speed with 2 kb buffer. 1.5 mb/s write and 2.5mb/s read.
I have noticed one thing though, usb transfer is slow with my nexus one. If I use a card reader then its pretty impressive. So I guess the problem is not with our sd cards but with froyo. I may be wrong.

BottleNeck SDHC Class

I have a Class 2 right now. I know, "groan".
But i want to get a HIGHER class.
At what class number on the G1 will I hit the bottleneck of the hardware?
What I'm asking is, is 6 the highest I can go and if I go to 8 it still performs like a 6 due to the slow reader in the phone?
Or can I go up to 8 class, 10 class, etc.
Also, I need someone to confirm that a high-class SDHC (like 8 or 10) even works on this phone, 8 or 16gb kind of thing.
Thanks for your input.
I want to get some o' dem swapz in here.
jcarrz1

I used to think grabbing a higher class card would be better too, i've actually bought a class 6 4gb and a class 4 8gb card, truth is it really don't matter what class you have..
Check this thread it made me see the truth.
http://forum.xda-developers.com/showthread.php?t=1010807

I haven't really looked at class in detail
http://en.wikipedia.org/wiki/Secure_Digital#Speed_Class_Rating
I'm filling in blanks here
it seems that a card will report it's class to the reader and it is then upto the application to decide if it meets it's requirements.
without pulling apart my G1 I have not been able to determine what the controller is to see find it's specs to see if there is a limit to what it can deal with in terms of through put.
I would like to think that the bottle neck is the card, and that a higher class card would be faster
a simple way of looking at it is that even if the G1 doesn't support 10MB/s
a card which does support 10MB/s is more likely to sustain 6MB/s better than a class 6
Sorry I can't provide a real answer here
I would look at the relative cost of class 6/10
if they are not disproportionate then I would go class 10
but if class 10 is 2 or 3 times the price, I would go class 6 (unless I had cash to throw away)
dmesg
Qualcomm MSM SDCC

Thanks for your input, both of you.
Is that script to increase performance that you linked to beneficial in-rom, or just in recovery?
Does that mean that upgrading the class 2 I already have is pointless??

could someone please run a test with the app called "SD Tools" in the market (someone with class 6)
tell me what rom and what speeds you get.
I get 4.3 mb/s write and 18.5 mb/s read. That's with a class 2 8gb on cos-ds WITHOUT SWAP running. <-- idk if that makes a difference.

I think I have a Kingston class 4 (possibly 6, i'm not sure) and my max was around 5.x mb write and 19.x mb read with SD Tools. That was with 2048kb sd cache.

that's not too much better than mine, the stat i posted above was 128, i got about the same as you with 2048.
It seems like you have to make the jump to class 10 in order to get decent speeds on an android phone.
if you take out the sd card and look at it, it will say the class inside a circle directly on the card.

jcarrz1 said:
that's not too much better than mine, the stat i posted above was 128, i got about the same as you with 2048.
It seems like you have to make the jump to class 10 in order to get decent speeds on an android phone.
if you take out the sd card and look at it, it will say the class inside a circle directly on the card.
Click to expand...
Click to collapse
I have a class 4 8gb I will run a bench hear in a second...

i have a 16gb class 10 and it writes @ 5mb/s and reads 17mb/s between a class4 and a class6 but im using apps to ext and swap

I have a MT3G with a 4GB class 2 and i ran SD tool twice and saw a small speed diffrence, the first is with stock 128 cache and second i temporarily set to 1024 cache
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XmeccaX said:
I have a MT3G with a 4GB class 2 and i ran SD tool twice and saw a small speed diffrence, the first is with stock 128 cache and second i temporarily set to 1024 cache
Click to expand...
Click to collapse
run a few times and it will average out
on a few runs I get (approx)
write 6.5
read 18.5
this is a class 6
so
some class hedge bets and they are classX+
regardless of class read is the same
so for swap class matters, but you may get lucky
for apps2sd , it probably doesn't make much difference
BUT this is just one benchmark program, it could be flawed
maybe a simple script with time would be better, but then you have the memory caching etc to consider
still it is interesting so far, certainly the writes seem to fit(ish)

R3N0V4D0 said:
i have a 16gb class 10 and it writes @ 5mb/s and reads 17mb/s between a class4 and a class6 but im using apps to ext and swap
Click to expand...
Click to collapse
could be a hw limit
OR your card was just a re-badged china thing
try without swap running, and the app on internal
that could be getting in the way
the bm app writes to /mnt/sdcard/

Class 6 microSD 8gb, unknown producer (china )
Write speed = 6.5 MB/s
Read speed = 15.2 MB/s
I don't use no modified cache, no swap.
Using 2048kb cache:
Write speed = 6.3 MB/s
Read speed = 18.3 MB/s
Thanks for the cache trick
"SD Speed Increase" app is good to change cache

did i win?

R3N0V4D0 said:
did i win?
Click to expand...
Click to collapse
absolutely, yes. What SD Card???

http://www.amazon.com/gp/offer-listing/B004H8FTCK/

R3N0V4D0 said:
http://www.amazon.com/gp/offer-listing/B004H8FTCK/
Click to expand...
Click to collapse
sweet, thanks

Wrong section!
Sent from my Mytouch 1.2 using XDA Premium App!

SanDisk 32GB Class 4 uSD card $37 - edit 11/06/11

SanDisk 32GB Class 4 uSD card $35 with shipping 10/11/11 only
http://mobile.dailysteals.com/
As of 11/06/11 $37 here:
http://www.icemonkey.com/andisk-32gb-microsd-high-capacity-32-gb-micro-sdhc-memory-card-adapter-kit
The 2 that I bought test out as class 6! Awesome read speeds too!
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Does the NOOK eat 32GB?

32GB is supported and is the max that can be added.

the class of the card really matters? If I use an 32GB class 10 on Nook it will be better than use a class 4? The nook really takes any advantage of a faster uSD card?

Class 4 and 6 Sandisk are best for use on Nook. It is the small block read and write performance that are important. That aspect doesn't factor into what Class rating a card gets which is more about large sequential access.
There are reports of stability issues when using Class 10 cards.

Deal is back on $37:
http://www.icemonkey.com/andisk-32gb-microsd-high-capacity-32-gb-micro-sdhc-memory-card-adapter-kit
These are great cards!
The 2 I bought test out as class 6!
Awesome read speeds!

Thanks for posting this! I was kicking myself that I missed out the first time they went on sale, but I have one on the way now.

Just got my sd card from icemonkey today.
Here is how it tested:
-----------------------------------------------------------------------
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 : 19.184 MB/s
Sequential Write : 6.978 MB/s
Random Read 512KB : 18.783 MB/s
Random Write 512KB : 1.616 MB/s
Random Read 4KB (QD=1) : 3.412 MB/s [ 833.1 IOPS]
Random Write 4KB (QD=1) : 1.389 MB/s [ 339.1 IOPS]
Random Read 4KB (QD=32) : 3.235 MB/s [ 789.8 IOPS]
Random Write 4KB (QD=32) : 0.977 MB/s [ 238.6 IOPS]
Test : 50 MB [J: 0.0% (0.0/29.7 GB)] (x2)
Date : 2011/11/15 16:48:38
OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

I have a general question about using crystaldiskmark for these tests. I used 3 different micro-sd cards that were varying brands, sizes, and classes when performing each test. The 2 write speeds that everyone seems to highlight ended up being .02 or .01 something for each card. Is that possible? I figure something was up with my computer. I'm new to testing cards like this, but these scores are so much lower than everyone else's, some even using the same cards as I am. I did the test with the internal micro-sd card reader on my PC. Am I doing something wrong? Even running the crystal test on my hard drive produced low scores in those areas.

First of all what brand and class of sd cards are you testing? Non-sandisk cards have almost all been shown not to have fast enough small block random write ratings to run CM7 satisfactorily.
Several people posting here had observed issues with sd card readers built in to their laptops/computers and used an external reader with better results.
Here is the link to the thread where extensive sd card testing was done by many of the forum participants:
http://forum.xda-developers.com/showthread.php?p=12964262

yeah I went through that whole thread before I posted as a reference and to see how to test. One of the cards was an 8gb sandisk, class 2. Another was a 2gb sandisk, class 2. Third was a 16gb something (in my phone right now and don't want to pull) that is class 10 or 6..All gave me the same results, which I would think is strange. For what it's worth, cm7 runs fast and smooth booting from my 8gb class 2 sandisk. But seeing those test results would say otherwise I would think. The 2gb sandisk booted and ran cm7 fine as well.

One thing you might want to check is if crystaldiskmark is set at 2 test runs, 50mb test size. I did a 5 test run, 500mb test size and got a really bad small block random write score around .100.
If your CM7 is running fine, then I wouldn't worry about it.

got me one thanks

Micro SD 64 SDXC vs OTHER

The better choice for micro sd .
SanDisk SDHC
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Samsung SDHC
SanDisk SDXC
Source: Blog

SDHC
The Secure Digital High Capacity (SDHC) format, defined in Version 2.0 of the SD specification, supports cards with capacities up to 32 GB.
Host devices that accept SDHC cards are required to accept SDSC cards.[1] However, host devices designed for SDSC do not recognize SDHC or SDXC memory cards, although some devices can do so through a firmware upgrade.
Click to expand...
Click to collapse
SDXC
The Secure Digital eXtended Capacity (SDXC) format supports cards up to 2 TB (2048 GB), compared to a limit of 32 GB for SDHC cards in the SD 2.0 specification....
Compatibility with SDHC
SDXC host devices accept all previous families of SD memory cards.[26] Conversely, SDHC host devices will accept SDXC cards that follow Version 3.0, since the interface is identical,[3] but the following issues may affect usability:
SDXC cards are pre-formatted with Microsoft's proprietary and patented exFAT file system, which the host device might not support. Since Microsoft does not publish the specifications of exFAT and its use requires a non-free license, many alternative or older operating systems do not support exFAT for technical or legal reasons. The use of exFAT on some SDXC cards may render SDXC unsuitable as a universal exchange medium, as an SDXC card that uses exFAT would not be usable in all host devices. Since the FAT32 file system supports volumes up to the SDXC's maximum theoretical capacity of 2 TB as well, a user could reformat an SDXC card to use FAT32 for greater portability between computers (see below). FAT32-formatted SDXC cards can be used in a host device built for SDHC if the host device can handle 64 GB and larger volumes.
SDHC host devices will not test the new capability bits defined for SDXC 4.0 cards. It will therefore not be able to use the new features of SDXC, such as transfer speeds above UHS104 (104 MB/s).
Click to expand...
Click to collapse
Speed Class Rating
32 GB SDHC card
The SD Association defines standard speed classes indicating minimum performance to record video. Both read and write speeds must exceed the specified value. These are defined in terms of suitability for different applications:[39]
Class 2 for SD video recording
Class 4 and 6 for HD ~ Full HD video recording,
Class 10 for Full HD video recording and HD still consecutive recording
UHS Speed Class 1 for real-time broadcasts and large-size HD videos
Click to expand...
Click to collapse
The specification defines these classes in terms of performance curves which translate into the following minimum performance levels, for both read and write, on an empty card:
Class 2= 2 MB/sec
Class 4= 4 MB/sec
Class 6= 6 MB/sec
Class 10≥ 10 MB/sec
Speed Classes 2, 4, and 6 assert that the card supports the respective number of megabytes per second as a minimum sustained write speed for a card in a fragmented state. Class 10 asserts that the card supports 10 MB/s as a minimum non-fragmented sequential write speed.[40]
Click to expand...
Click to collapse
and here is some info on UHS-I BUT NO CURRENT PHONE AT THIS TIME SUPPORT THIS.
UHS Speed Class
The Ultra-High Speed (UHS) designation is available on some SDHC and SDXC cards.[42] The following ultra-high speeds are specified:
UHS-I cards, specified in SD Version 3.01,[40] support a clock frequency of 100 MHz (a quadrupling of the original "Default Speed"), which in four-bit transfer mode could transfer 50 MB/s. UHS-I cards declared as UHS104 also support a clock frequency of 208 MHz, which could transfer 104 MB/s. UHS-I is the only class for which products are currently available.[43]
Click to expand...
Click to collapse
for a video explanation Lucidmike78 does an excellent job.

imon22s said:
and here is some info on UHS-I BUT NO CURRENT PHONE AT THIS TIME SUPPORT THIS.
for a video explanation Lucidmike78 does an excellent job.
Click to expand...
Click to collapse
The app that this guy uses is old, it is no updates from 2011 in the Google Play Store. This app is better for the new technologies

What Micro SD Card To Use Xperia Z

hi guys
whats the best micro sd card to use with the xperia z ?
I know this have probably been asked before
ive seen class 4 cards all the way up to class 10 cards
does the class even matter ???

I did seem to have an issue playing films with my 32GB Class 4 but since I've bought the SanDisk Ultra 64GB Class 10 it's been just fine.

If I am correct, 4.2.2 supports 64GB officialy.

droidhd said:
If I am correct, 4.2.2 supports 64GB officialy.
Click to expand...
Click to collapse
In exFat yes, but choose the SD you think you need
The SD Association defines standard speed classes indicating minimum performance to record video. Both read and write speeds must exceed the specified value. These are defined in terms of suitability for different applications:[40]
Class 2 for SD video recording
Class 4 and 6 for high-definition video (HD) to Full HD video recording,
Class 10 for Full HD video recording and consecutive recording of HD stills
UHS Speed Class 1 for real-time broadcasts and large HD video files
The specification defines these classes in terms of performance curves that translate into the following minimum read-write performance levels on an empty card:[41]
Speed Classes 2, 4, and 6 assert that the card supports the respective number of megabytes per second as a minimum sustained write speed for a card in a fragmented state. Class 10 asserts that the card supports 10 MByte/s as a minimum non-fragmented sequential write speed.[41] By comparison, the older "×" rating measured maximum speed under ideal conditions, and was vague as to whether this was read speed or write speed.
The host device can read a card's speed class, unlike the earlier "×" speed ratings. A device can warn the user if the card reports a speed class that falls below an application's minimum need.[41]
The speed class rating does not totally characterize card performance. Different cards of the same class may vary considerably while meeting class specifications. In addition, speed may vary markedly between writing a large amount of data to a single file (sequential access, as when a digital camera records large photographs or videos) and writing a large number of small files (a random-access use common in smartphones). One study found that, in this random-access use, some Class 2 cards achieved a write speed of 1.38Mbit/s, while all cards tested of Class 6 or greater (and some of lower Classes; lower Class does not necessarily mean better small-file performance), including those from major manufacturers, were over 100 times slower.[42]
Click to expand...
Click to collapse
Source http://en.wikipedia.org/wiki/Secure_Digital

Included in this software
There are many new features in this upgrade for your Xperia™ smartphone, some examples are:
The my Xperia application that helps you find your phone and secure everything you have on it. Read more at myxperia.sonymobile.com
New customisable navigation bar with quick settings
New widget functionalities, both on lockscreen and homescreen
Support for bigger (64GB) SD card so that you can store even more on your Xperia™
Source

Oh great, I can finally expand it up to 64 GB!

thanks guys
that has solved my question thank u
just ordered my 64GB mico sd class 10 card
cheers for the help

droidhd said:
If I am correct, 4.2.2 supports 64GB officialy.
Click to expand...
Click to collapse
Not only, JB support 64GB any version, i'm using a Micro SDXC Classe 10 64Go UHS-1 Grade 1 70MB/s since i have my Xperia Z and it's works perfectly.

Toshiba Exceria Class 10 32Gb MicroSD HC UTS...u wont regret after buying it! amazing card!

im using atm 16gb class 4 .. bcuz my 32gb class 10 was gone after i got my xperia from service -.-

Im using Transcend 32gb class 10
Work great !

Running SanDisk 64 class 10 here, loving the space upgrade from my iPhone

im currently running sandisk 32GB class 4, almost full capacity and it works great

Samsung 64 GB, Class 10
probably offering best transfert rates for its capacity
it has shown between Samsung has an edge over Sandisk Micro SD card

I was using a Sandisk 32gb class 10 ultra. But it suddenly yesterday stopped working. Was working fine. Now can't even get the pc to read it, how can that happen.

So, I just got the Z through T-Mobile and am (casually) looking into getting an SD car for it. Should I hold out until the device is upgraded to 4.2 before getting a 64gig card? I'm assuming it wouldn't be compatible beforehand.
I suppose I could look into rooting the Z as well... (I'm kinda hesitant about that, though)

Running Samsung Plus 32GB Class 10 Card.
Sent from my XPERIA Z with Tapatalk 4

Bad SD card?
I bought a generic 64gb class 10 microSD card from ebay, great seller, great reviews. but it seems that my Xperia corrupts it once in a while and wants to format it. I started it with exfat, but then learned that FAT32 is better, so did that.. but the same result, after a week , the SD card just crashed and corrupted and wanted a format, as the phone stopped reading it.
Is there anything that i'm missing, or shall i just chalk it up to bad sd card and get a sandisk or transend branded card?

It's not your card, it's a fault with the Xperia z, my class 10 SanDisk 32GB got corrupted two days ago as well, lots of folk reporting the same, seems class 4 is ok, any one confirm that?
Sent from my C6603 using xda app-developers app

SanDisk Ultra microSDHC 32 GB
I am using SanDisk Ultra microSDHC 32 GB
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SanDisk Ultra microSDHC UHS-I With SD Adapter
Form Factor microSDHC
Speed Up To 30MB/s
Capacity 32GB
Class10