Develop Bugs

sd card speed test

Has anyone tried this app? Been having issues with music cutting out when sd card is in use since upgrading to 2.2. So I thought i`d run this test as I have a transcend 8gb class 6 card. This app is reporting I have a class 2!?
My results are
write speed 3.0 mb/sec
read speed 7.0 mb/sec
Anyone else care to share their results, would like to know if this app is wrong or i`ve got a fake card.
Thanks

Just tried out the app and it says I have a class 4 card with a write speed of 5mb/s and read of 6mb/s though its rated at being a class 6 Transcend. I've got access to some other cards at work so I'll try them out as well. Might help to defrag?
Sent from my HTC Desire using XDA App

Thanks, actually I re-booted and closed down all non-essential apps and I got a 6mb/sec read/write saying it was a class 6.
But looking round the web people are reporting 10mb+ /sec on a class 6

Hv installed the app and made 3 tests successively for my 16Gb sandisk Class2 sd-card, said "Class2" as expected (second test resulted "ClassUnknown" and read speed was nil) anyway, overall result is;
Write speed: 2 Mb/s
Read speed: 1 Mb/s (!)
I thought read speed would be twice as much than the write speed; confused & disappointed!
Sent from my HTC Desire using XDA App

Getting the same problem with music skipping. Annoying as hell and only started since updating to 2.2

If you read what it says as tip 2 down the bottom, a class 6 card means a minimum read/write speed of 6mbps so it wouldn't be uncommon to see a higher read/write speed for the card. Wonder what a format would do for it.
Sent from my HTC Desire using XDA App

paulruk said:
Has anyone tried this app? Been having issues with music cutting out when sd card is in use since upgrading to 2.2. So I thought i`d run this test as I have a transcend 8gb class 6 card. This app is reporting I have a class 2!?
My results are
write speed 3.0 mb/sec
read speed 7.0 mb/sec
Anyone else care to share their results, would like to know if this app is wrong or i`ve got a fake card.
Thanks
Click to expand...
Click to collapse
Same card, same results.to get class 6 results you must haver perfect conditions and sequential write. Reading can usually be higher. I'm not sure, but I think it also deteriorates with time.

Ive got a 16gb Play.com Card and had the card for about 2 years now.
Its says class 2 on the card but i get the following.
1st test, Class 2
2nd test, Class 4
3rd test, Class 4
4th test, Class 4

CharlieCharlie24 said:
Getting the same problem with music skipping. Annoying as hell and only started since updating to 2.2
Click to expand...
Click to collapse
Yeah, and theyve screwed up web browsing. Think i`d rather have 2.1 back.

Jabbafat23 said:
If you read what it says as tip 2 down the bottom, a class 6 card means a minimum read/write speed of 6mbps so it wouldn't be uncommon to see a higher read/write speed for the card. Wonder what a format would do for it.
Sent from my HTC Desire using XDA App
Click to expand...
Click to collapse
Well looking at this thread http://androidforums.com/htc-evo-4g/86850-htc-evo-4g-sd-card-speed-test.html
Someone has the same card as me but getting 10mb/sec read & write. Albeit on an htc evo. But cant think it would make any difference.

It should also make sense that A2SD and Dalvik Cache to SD even more, will impact the test, no matter how much you close and kill processes before running the test.
For 720p purposes, I'd like to know if anyone who had problems with the stuttering (not low fps, but the frozen frame now and then), solved this with an upgrade in class and if it's really needed a class 10. Again, A2SD+ can be a factor in this.
Anyway, I've tried a cheap sandisk class2 16GB:
- first run, everything on, auto screen off: read 2MBit, write 3Mbit -> class 2
- second run, airplane on, auto screen off: same
- third run, killed everything, screen always on: read 6Mbit, write 3Mbit -> class 2
- fourth run, as above: same results
The interesting bit is that my transcend class 6, 8GB one, had very very similar results, with bumps to 4Mbit write right after boot, when killing everything...
That's what makes me hesitate to buy a class 10 card. Will the actual usage speed improve so much to justify the cost, especially on 720p ?

andycted said:
It should also make sense that A2SD and Dalvik Cache to SD even more, will impact the test, no matter how much you close and kill processes before running the test.
For 720p purposes, I'd like to know if anyone who had problems with the stuttering (not low fps, but the frozen frame now and then), solved this with an upgrade in class and if it's really needed a class 10. Again, A2SD+ can be a factor in this.
Anyway, I've tried a cheap sandisk class2 16GB:
- first run, everything on, auto screen off: read 2MBit, write 3Mbit -> class 2
- second run, airplane on, auto screen off: same
- third run, killed everything, screen always on: read 6Mbit, write 3Mbit -> class 2
- fourth run, as above: same results
The interesting bit is that my transcend class 6, 8GB one, had very very similar results, with bumps to 4Mbit write right after boot, when killing everything...
That's what makes me hesitate to buy a class 10 card. Will the actual usage speed improve so much to justify the cost, especially on 720p ?
Click to expand...
Click to collapse
I've had stuttering with video and my class 6 8gb transcend. I never use to, I blame 2.2
For that too. So much for a speed improvement , only thing that feels.quicker in 2.2 are app installs.

For reference, if anyone is interested:
HTC Desire, unbranded, generic Froyo 2.2 ROM with apps on the SD card as well
Sandisk 32GB Class 2 card shows:
Write speed: 4mb/s
Read speed: 2mb/s
Measured as a Class4 card.

removed

Kingston 16GB MICROSDHC CLASS 2:
Write 5MB/s
Read 16MB/s
Using: Galaxy S
Buffer: 1MB

Samsung 8gb class 6
Write 2mb
Read 6mb
I'm running a2sd+ though...
Sent from my HTC Desire using XDA App

Don't defrag non-mechanical memory devices
1 - you won't see (or measure) any difference
2 - the memory cells have a limited # of write cycles, which will be seriously impacted by useless defragging

I had the same problem as the OP (slow SD since Froyo upgrade causing music dropouts). Here's my collection of links to related posts, unfortunately I haven't found a solution except using a non-Sense ROM (e.g. Cyanogenmod).
http://forum.xda-developers.com/showthread.php?t=781606#9
http://forum.xda-developers.com/showthread.php?t=743792
http://forum.xda-developers.com/showthread.php?t=778748
http://forum.xda-developers.com/showthread.php?t=723073
I think it's kernel-related; I tried running the kernel from a Froyo/Sense ROM with the rest of an Eclair/Sense ROM and the SD card read speed was low (couldn't measure the speed with the SD Card Speed Test app because the touchscreen didn't work but I was able to adb in and use "dd").

Since a number of us are experiencing this problem I think it's worth us all reporting it to HTC support. If they know that a lot of people are seeing much worse SD card speeds in 2.2 than in 2.1 then they're more likely to fix it in a future update.
I've reported it to them already

Read 10MB/sec
Write 5MB/sec
It rated it as a class 4 card(Which it is), I'm quite surprised at that performance since I bought it for hardly 5$.

[Q] SD card speed

I have been trying some roms over the last few days and experience quite a big difference in speed. Some roms lag quite a bit, especially when opening sense apps.
My question is, does this depend on the speed of the SD card? I have a class 2 now (ordered a class 10 though). Are sense apps run from the SD card or the NAND?

Yes, it depends on the speed of the SD card, as in case of custom ROMs, all the apps are usually stored on the external partition. Plus at least a class 6 card is suggested in order to avoid the lags.

reynard80 said:
I have been trying some roms over the last few days and experience quite a big difference in speed. Some roms lag quite a bit, especially when opening sense apps.
My question is, does this depend on the speed of the SD card? I have a class 2 now (ordered a class 10 though). Are sense apps run from the SD card or the NAND?
Click to expand...
Click to collapse
I wouldn't buy a class 10 SD card for use with the Desire. Not all class 10 cards work, you best bet is class 6.

Pipusz said:
Yes, it depends on the speed of the SD card, as in case of custom ROMs, all the apps are usually stored on the external partition. Plus at least a class 6 card is suggested in order to avoid the lags.
Click to expand...
Click to collapse
Is sense also stored on the SD card in case of custom roms? Or just the apps?
shankly1985 said:
I wouldn't buy a class 10 SD card for use with the Desire. Not all class 10 cards work, you best bet is class 6.
Click to expand...
Click to collapse
Well, ok, the class 10 has been delivered today, so I'll check it out tonight.
What kind of problems could a class 10 have in the desire? Not working at all?

Class 10 works ok as long as they are a respectable brand. Also you may want to consider installing SD Booster from market to increase deafult cache size to 1024kb or 2048kb

reynard80 said:
Is sense also stored on the SD card in case of custom roms? Or just the apps?
Well, ok, the class 10 has been delivered today, so I'll check it out tonight.
What kind of problems could a class 10 have in the desire? Not working at all?
Click to expand...
Click to collapse
Performance problems, the cards not doing there proper write and read speed. Let us know how you get on with new card please

Have tried the new card. It's a Transcend 16GB Class 10. Getting about 18Mb/s sequential reads and writes in windows.
Have benched it in stock froyo on my desire with SD Tools: 14,5 MB/s write and about 8 MB/s read. Strange that the read speeds are lower. Then again, it seems that there are no reliable SD speed benchmarks on Android..

Which to choose Apps2Sd or Data2Sd

Hi,
I have two partition 14 gb Fat32 and 2 gb Ext4 and I want that all installation goes on ext4 (without using internal strorage) so in this case what should I choose Apps2Sd Or Data2Sd?
thanks.

I wouldn't bother with data2sd unless I had a card of class 6 or higher.

I very much agree Class 6+ to get the benefit

Well you would want to choose data2sd, if you want as much to be on the sd-card as possible, however it is usually quite a lot slower than using internal, and there is no reason to leave internal completely empty.
Also you can't run everything from the sd-card. The system-partition will still be on internal as well as boot and so on.

mortenmhp said:
Well you would want to choose data2sd, if you want as much to be on the sd-card as possible, however it is usually quite a lot slower than using internal, and there is no reason to leave internal completely empty.
Also you can't run everything from the sd-card. The system-partition will still be on internal as well as boot and so on.
Click to expand...
Click to collapse
Thank you mortenmhp,
I have sd-card of class 10, will still be a lot slower than internal?
thanks.

I use class 4 and have done from day one with droidzone's roms and it runs great.

I use a class 10 8GB card, and use Apps2sd. Dont really feel the need to use Data2sd.
Ive got alot of apps and still got some memory left so its all cool

Well it might not be too slow, but only do it, if you need the space, in which case it's a good solution.
But the more you move to the slower memory the more time will be spend accessing it.
But I'll encourage you to try it out for your self, as it's very individually(just make a nandroid backup and try different rom solutions) personally with my sd-card there is no way i'd use it for everyday use(flashed it a few times, and always got a slow and lagging system), while other people seem to have it working fine

Ok I will try,
Thank you mortenmhp...

Your question should be which do i need?
People rarely 'need' data2sd - apps2sd is 'usually' enough!

BigMrB said:
Your question should be which do i need?
People rarely 'need' data2sd - apps2sd is 'usually' enough!
Click to expand...
Click to collapse
thanks for the infos

how do you know what class your sd card is?

there is a figure 2 or 4 or 6 or 10 in a circle printed on the sd card or you can install sd tools from market to benckmark it ( 2 means 2 mb/s , 4 means 4 mb/s,... aso )

i'd say go for apps2sd then if you need data go for that after

cartus said:
there is a figure 2 or 4 or 6 or 10 in a circle printed on the sd card or you can install sd tools from market to benckmark it ( 2 means 2 mb/s , 4 means 4 mb/s,... aso )
Click to expand...
Click to collapse
Normally you need a magnifying glass because it is a tiny number............. see figure.

Free today on amazon
Sent from my HTC Desire using Tapatalk

I now use data2sd with MIUI rom and a class 6 samsung sd card £16 from play.com
I would defo recommend this card, I didn't think from class4 to class6 would be that much difference I was wrong. I can now record videos without a single lag, phone is easy 10x faster and smooth, also MIUI is superb rom

Hi,
Most of the times a class 6 or 10 is much "slower" than a good
class 4 like the sandisk mobile ultra of 4Gb (The one of 8 Gb is slow !!).
The problem is that te typical test of writing/reading to/from a single file doesn't guarantee the behaviour of the card when used intensively.
When many files are involved, things change dramatically and a good memory controller is a must, and many of the class 6 /10
don't have one.

jdolmen said:
Hi,
Most of the times a class 6 or 10 is much "slower" than a good
class 4 like the sandisk mobile ultra.
The problem is that te typical test of writing/reading to/from a single file doesn't guarantee the behaviour of the card when used intensively.
When many files are involved, things change dramatically and a good memory controller is a must, and many of the class 6 /10
don't have one.
Click to expand...
Click to collapse
Is there a app to test that?
Sent from my HTC Desire using XDA Premium App

cartus said:
there is a figure 2 or 4 or 6 or 10 in a circle printed on the sd card or you can install sd tools from market to benckmark it ( 2 means 2 mb/s , 4 means 4 mb/s,... aso )
Click to expand...
Click to collapse
I have a 8gb sandisk class 4 in a stock desire and am getting 6.8 meg read and write when I test

Micro SDHC Classes

Hi,
I need someone's advise here. is class 4 has a big difference with class 6 using app2sd? because here in our country (PHL), i can't find class 6. i found some but i'm afraid that its fake. I'm planning rather to use class 4.
anyone using class 4 for app2sd on coolexe rom? Thanks!

Minimal difference between class 6 and 4 - maybe faster file transfer to the card from the PC. I used a 8GB class4 before I got a 16GB class 6 with Insertcoin (froyo), but did not notice any significant change. By the way, if you get a good brand class 4 it can perform as a cheaper class 6.

Thanks for the quick response. I'm thinking of Kingston vs Sandisk on same class 4. Which brand is better?

They are both good. Buy the one which is cheaper.
And don't say thanks, use the button.

got it. i wish i can push it 100x to you.

I'm using a Kingston class 4 at the moment and I can't fault it
Swyped from my CM7.1 Desire using XDA Premium App

Card's class doesn't relate to sequential read and write speeds which are crucial for a2sd and data2sd scripts. Therefore, it could happen that you have a class 4 card which could outperform higher class card in terms of performance.

how about moving dalvik cache to sd-ext? what can you advice? will these class 4 or 6 speed will vary? please help. thanks!

It is always better to have dalvik on nand as it seems to be more consistent regarding what I already wrote. Nand is equal to about class 5 or 6, but that means only when you are transferring large files. If you have a2sd+ script, dalvik is already on sd-ext.

how about on cool3d sense 3.0? i think the dalvik stays on the nand. but the apk is on sd-ext. and it has a zip add-on to move dalvik cache to sd. am i right? i'm not so sure.

On the Cool3D sense 3.0 rom standard the dalvik stays indeed on the nand, but you can flash the zip file at the bottom to move it to the sd-ext. The performance afterwards stays more or less the same.

can't wait to try to move dalvik cache to sd-ext. i have class 2 microsd right now but i'm planning to buy a higher microsd. but i will try it before having the class4 or 6 sd card just to see the differences of the microsd class.
do you think this will have a slower effect?

ok so i bought a kingston class 4 and in sd tools it says the cards name is sd16g something and im getting 3.6mb/s write and 17.5mb/s read. is this normal?

i'm getting 5.+ mb/s on write and 13.+mb/s on read with class 2 sd card. try CrystalDiskMark to test your sd card.

still getting these values. is this normal or this sd may be fake?

maybe it's not. just like what they said in the first page. some class 4 performs better than class 6. maybe my class 2 performs better than the other class 4. try to see the speedtest by using crystaldiskmark. maybe that's better than sd tools.

[Q] What Class Of SDcard?

Hi, im buying a 32gb sdcard for this phone but what class should i get?
I read somewhere that a class 10 is too fast to be able to run apps of it, when apps are moved to sdcard. Is that right?
If so, what class are all yours? 2, 4, 6, 8 or 10? Have you had troubles with them, or do they work fine?
Thanks

Jordanooo said:
Hi, im buying a 32gb sdcard for this phone but what class should i get?
I read somewhere that a class 10 is too fast to be able to run apps of it, when apps are moved to sdcard. Is that right?
If so, what class are all yours? 2, 4, 6, 8 or 10? Have you had troubles with them, or do they work fine?
Thanks
Click to expand...
Click to collapse
I'm using a class 10 32gb card and i've had no issue with any apps when i move them to SD card, why would an app care about the speed of an SD card? and wouldn't it be the opposite for an apps speed? (class 2 card slow to start etc)
BTW the class system isn't really important with android because fast read and writes arnt critical for apps to run fast (helps a little) so go with class 10 (there cheap anyway, plus you should get over 10MBPS read/write)

ff7fan4eva said:
I'm using a class 10 32gb card and i've had no issue with any apps when i move them to SD card, why would an app care about the speed of an SD card? and wouldn't it be the opposite for an apps speed? (class 2 card slow to start etc)
BTW the class system isn't really important with android because fast read and writes arnt critical for apps to run fast (helps a little) so go with class 10 (there cheap anyway, plus you should get over 10MBPS read/write)
Click to expand...
Click to collapse
Thanks, i thought the same thing about the speed :S dunno what he was on about haha. Ill go for a class 10 one
Thanks again!

Some people have had issues with class 10 cards as random access times can be slower. I have a class 6 and it works fine.
See this thread in xperia play accessories for more details
http://forum.xda-developers.com/showthread.php?t=1129749

sorry about creating a double thread, i didn't see that one

class 4 and/or 6 for me..

got a class 4... working awesome on my r800i, 2 co workers want 1 for the Htcs phones lol!

My sdcard is class 2, and all of my apps work just as fast as if they were internally installed