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.

[Q] Best micro SD for Incredible S

Hi,
I've search in the forum for a topic talking about this and I didn't see anything so excuse me if i double post.
Second excuse I'm french .. excuse my poor english.
Real topic now :
I would like to know if there would be a big differences between all the class of the sd card (class 4 to 12 i think) If yes, wich one do you suggest not to pay 100$ and have a good data transfer rates.

lalexl said:
Hi,
I've search in the forum for a topic talking about this and I didn't see anything so excuse me if i double post.
Second excuse I'm french .. excuse my poor english.
Real topic now :
I would like to know if there would be a big differences between all the class of the sd card (class 4 to 12 i think) If yes, wich one do you suggest not to pay 100$ and have a good data transfer rates.
Click to expand...
Click to collapse
Here is a good article about SD card class ratings on wikipedia:
http://en.wikipedia.org/wiki/Secure_Digital#Speed_Class_Rating
Ou en français si tu préfère:
http://fr.wikipedia.org/wiki/Carte_SD#D.C3.A9bit
I'm not sure if the class would make a real difference in a smartphone... In a DSLR camera sure but in a phone, not so much!
But obviously it greatly affects the time it takes to write data on the card itself (Class 4: 4MB/s Class 10: 10MB/s).
I am myself looking to buy a 32gb card and my choices are either Kingston or Patriot.
Kingston sells their class 4 card around 75$ CAN
http://www.ncix.com/products/?sku=57109&vpn=SDC4/32GB&manufacture=Kingston
Patriot sells their class 10 card around 100$ CAN
http://www.memoryexpress.com/Products/PID-MX32239(ME).aspx
For the price difference, I think I would go with Patriot

Lexar also do a 32FBI class 10 for a reasonable price in the UK (£70) which is the one I am planning to get (i filled up 8GB in no time with music )
Sent from my HTC Incredible S using Tapatalk

l0st.prophet said:
Lexar also do a 32FBI class 10 for a reasonable price in the UK (£70) which is the one I am planning to get (i filled up 8GB in no time with music )
Sent from my HTC Incredible S using Tapatalk
Click to expand...
Click to collapse
Just find it use shopbot and search for LSDMI32GBSBNAR

I personally use a SanDisk 32GB Class 4 MicroSDHC card(the same one that comes with the HTC Thunderbolt). With audio/video playback it's always smooth(never any audio/video glitches) and pictures/video recording start up right away.

Class 10 DNA mem cards:
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Not realy usefull since you dont compare to a cat 6 or cat 4
Does this bench come from your phone or computer ?

i do remember once reading an article about a higher read/write speed means also a higher random access lag, which is bad if you are looking to run apps off of your mSD

I was having problems with a Patriot 16GB class 10 microsd in my Incredible S. Video recording would shut down after a couple seconds. Weird stuttering in the OS.
Patriot acknowledged a problem with their 32gb class 10 in Android and Windows 7 phones. Might've affected some of their 16gb.
Here's my CrystalDiskMark results for the Patriot:
Sequential Read : 18.072 MB/s
Sequential Write : 12.572 MB/s
Random Read 512KB : 18.107 MB/s
Random Write 512KB : 0.702 MB/s
Random Read 4KB (QD=1) : 3.730 MB/s [ 910.6 IOPS]
Random Write 4KB (QD=1) : 0.006 MB/s [ 1.4 IOPS]
Random Read 4KB (QD=32) : 4.010 MB/s [ 978.9 IOPS]
Random Write 4KB (QD=32) : 0.007 MB/s [ 1.6 IOPS]
I switched to a Sandisk 32gb Class 2. No problems.
Here's my CrystalDiskMark results for the Sandisk:
Sequential Read : 14.121 MB/s
Sequential Write : 5.964 MB/s
Random Read 512KB : 13.305 MB/s
Random Write 512KB : 5.582 MB/s
Random Read 4KB (QD=1) : 1.097 MB/s [ 267.7 IOPS]
Random Write 4KB (QD=1) : 0.484 MB/s [ 118.2 IOPS]
Random Read 4KB (QD=32) : 0.873 MB/s [ 213.1 IOPS]
Random Write 4KB (QD=32) : 0.161 MB/s [ 39.3 IOPS]
Based on other people's results, higher classes have really poor Random Write 4KB speeds. Not sure if that matters in Android.
I'd recommend getting a lower class Sandisk. Lower class Sandisk usually perform at a higher sequential write speed than their stated class, and still have good random write speed.

lalexl said:
Hi,
I've search in the forum for a topic talking about this and I didn't see anything so excuse me if i double post.
Second excuse I'm french .. excuse my poor english.
Real topic now :
I would like to know if there would be a big differences between all the class of the sd card (class 4 to 12 i think) If yes, wich one do you suggest not to pay 100$ and have a good data transfer rates.
Click to expand...
Click to collapse
1) class 12 will not support for mobile phones
2) class 10 had made some devices to go weird
3) class 6 would b the best choice to select for its value for money and performance
4) i will not recommend u to buy a class 4
5) there will not be any huge difference in read/ write speed whn compared between class 6 nd class 10

I have got Lexar's 32GB Class10 on order, so I will let you know how it performs later this week

kingston class 10 16gb, never will use another one

i am using ADATA AUSDH32GCL2-R, bought it in germany, works perfect, tested in marvel, saga, vivo, ace

Just got my new card
Lexar 32GB microSDHC class10
Initial benchmarks show it is much quicker than all the other microSD's I have in larger writes, but is actually slower than a class 4 in the very small writes, so it remains to be seen if it speeds up day to day useage. Capacity is as advertised and comes with a nice compact USB adapter, overall, very pleased as I can now fit all of my music on it
Will post some proper benchmarks later

Will go with a patriot 10 8gb

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!

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