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Sandisk 8gb Ultra Micro SDHC Benchmark

Hi I was wondering if owners of the Sandisk 8gb Ultra Micro SDHC could benchmark the drive using: http://www.techpowerup.com/downloads/1137/ATTO_Disk_Benchmark_v2.34.html
Please could you put transfer size from 2 - 8192 and total length to 256mb . Also make sure you choose the right drive letter then press start. I just wanted to know how quick it is at transferring small chunks and large chunks of data. Once its done (should take about 10-20 minutes) , please could you save it as a bmk file and upload it on to here as an attachment or take a screenshot and post here.
Thanks in advance to whoever can do this. I will be very grateful.

http://www.i4u.com/full-review-447.html

Very slow copying to SD card

I have a new 8 GB Ultra SD card on my TP.
Copying 5-10MB file to SD card is very fast, but when I tried to copy 100MB file transfer is very very slow.
First I tried to copy a file from PC to SD card, than also from device internal memory to SD card. Exactly the same behaivor. At the beginning transfer data rate is about 1MB/s. After about 35% it drops to about 70KB/s. At the end is about 25KB/s only (very very slow).
SD card is formatted FAT32/512. It was formatted with two different programs.
Any hint?
Thanks for help in advance!

are you transferiing the file through active sync or disk drive mode

USb transfer is always slow, it if fastest for me to simply remove the card and use it directly on the PC. I know others do to.

get a better SD card? eg. Class 6?

Try tnyynt SD TuneUp (cab below). See this thread: http://forum.xda-developers.com/showthread.php?t=451983&page=2

I used this when I 1'st got my Micro SDHC Class 6 card:
http://panasonic.jp/support/global/cs/sd/download/sd_formatter.html

Just a comment.
When I copy 250MB file from PC to SD card via Card Reader transfer is finished in 10 seconds. So I think that a card is not a problem (file system included).
I will try SD TuneUP.cab!

Also note the question from puddle22 above. Transfer via Activesync is always slower, primarily because it's a connection geared toward the entire pda system. If you connect as a usb drive, then it's just reading your SD card and should be much faster.

I understand that transfer rate on activesync is much slower, but with the rate of 50KB/s it is extremelly slow. On my HERMES with my old 2GB SD card is much much faster on big files (>100MB).
It is also strange that transfer from TP to SD card is very slow too.

That is odd. Just a shot in the dark here, but have you tried a different cable?

running App on SD closes down when power on

Does anyone know how to get around this problem.
I have apps installed on the SD and when the Uni is switched ON, the app will close.
Tomal states that "It is because of the PM for SD. Also, latest kernel's are very "efficient"" and has suggested disabling Power Management for SD. This didn't fix it for me.
Has anyone any suggestions or fixes? Or perhaps this doesn't effect all SD cards (mine's a class 6 8GB)
(NB. I started a new thread as this is not a problem with Tomal's ROM, but seems to be a WM6.x 'feature').

JonMorgan said:
Does anyone know how to get around this problem.
I have apps installed on the SD and when the Uni is switched ON, the app will close.
Tomal states that "It is because of the PM for SD. Also, latest kernel's are very "efficient"" and has suggested disabling Power Management for SD. This didn't fix it for me.
Has anyone any suggestions or fixes? Or perhaps this doesn't effect all SD cards (mine's a class 6 8GB)
(NB. I started a new thread as this is not a problem with Tomal's ROM, but seems to be a WM6.x 'feature').
Click to expand...
Click to collapse
Hi jon,
I've just tested it in 3 different SD cards.
Result is interesting: running application do not get closed for 2 of them but it is the same of you for another card!
Affected one is a 4GB SD, it is a non-branded card.
Hope this information helps.

Ah now this is interesting. I usually use SD Settings Type I for my card (I get better benchmark results). But in switching to Type II I now don't have the aformentioned problem.
Code:
measurements in ms Type-I Type-II
Write 1MB file 2370 6226
Read 1MB file 998 1502
Copy 1MB file to card 1156 5926
Copy 1MB file from card 2045 2773
Write 10k x100 files 6772 10490
Read 10k x100 files 1179 1579
Copy 10k x100 files to card 5778 10610
Copy 10k x100 files from card 4528 8913
Directory list of 2000 files 209 203
(using spb benchmark 1.6.0)
However, I really don't want this fix to be the only solution, as you can see the card runs a lot slower with Type-II settings
Anyone can test this out on their card... what is your card? Mine is veho 8GB class 6. [nb, ask me if you are interested in spb benchmark to test]

SD card speed fix (5Mbps to 15Mbps)

I guess no one had really noticed, but there is a major flaw with the evo. The microsd read speed is severely limited. I just bought a new Patriot 32gb class 10 micro sdhc card, and the read speed was great on my pc, but on my evo it was getting stuck at 5Mbps oi tested with "sd card speed tester" while my write speed was correct at 11Mbps. I don't understand why all developers aren't integrating it into their roms/kernels , it doesn't make sense... All you have to do is use root explorer or some other root file manager and navigate to "/sys/devices/virtual/bdi/179:0/" and open the file "read_ahead_kb" with a text editor (with root explorer just long press the file and select "open with text editor", and if the value is anything other than 128, change it to 128 and save the file. The read speed on my new class 10 card went from 5Mpbs to 15Mbps, BIG DIFFERENCE! Only problem with doing it this way is it changes back to 4 after a reboot. There if a flashable file in the post I got this info from ( http://forum.xda-developers.com/showthread.php?t=815557&page=19 ) but I haven't tried it. Apparently it is very easy to integrate... Enjoy the correct speeds for your card! Please visit the post to see who solved this issue, it surely wasn't me!

If you want to increase the read ahead buffer automatically here's a gscript which does it.
Based on: echo 128 > /sys/devices/virtual/bdi/179:0/read_ahead_kb
Oops xda doesn't attach text?
Just enter the echo line in terminal.
cat /sys/devices/virtual/bdi/179:0/read_ahead_kb
echo 128 > /sys/devices/virtual/bdi/179:0/read_ahead_kb
cat /sys/devices/virtual/bdi/179:0/read_ahead_kb
Sent with Super-Sonic Vision using XDA app.

this worked for me but i would like a flashable zip so i dont have to do it every reboot

thanks for the tip, when i checked mine, i was already at 128

I have been wondering about my sd card speed here lately..Anyone know a free app on the market to test my speed?
cm7 has 128 already set so thats not it cause my card read seems slow.

mine was set to 4 as well.. What you can also do is add the echo line to a script in the init.d folder and every time the phone boots up it should echo the command to the file and change it.

mine is just set like this
4
thats it no more than that

MrDSL said:
I have been wondering about my sd card speed here lately..Anyone know a free app on the market to test my speed?
cm7 has 128 already set so thats not it cause my card read seems slow.
Click to expand...
Click to collapse
free version of the Sdcard speed tester

Jus10o said:
mine was set to 4 as well.. What you can also do is add the echo line to a script in the init.d folder and every time the phone boots up it should echo the command to the file and change it.
Click to expand...
Click to collapse
I know I could just go searching for this, but given my physical state and my lack of lucidity bc of pain pills, im going to have to ask, lol, anyway you can put complete instructions on how to add this line to the init.d folder and have it work at every boot? Thanks so much... btw, long time no see... since heroc days lol
Sent from my sweet HTC EVO running Myn's Warm TwoPointTwo RLS 5 with all the goodies

lahma69 said:
I guess no one had really noticed, but there is a major flaw with the evo. The microsd read speed is severely limited. I just bought a new Patriot 32gb class 10 micro sdhc card, and the read speed was great on my pc, but on my evo it was getting stuck at 5Mbps oi tested with "sd card speed tester" while my write speed was correct at 11Mbps. I don't understand why all developers aren't integrating it into their roms/kernels , it doesn't make sense... All you have to do is use root explorer or some other root file manager and navigate to "/sys/devices/virtual/bdi/179:0/" and open the file "read_ahead_kb" with a text editor (with root explorer just long press the file and select "open with text editor", and if the value is anything other than 4, change it to 128 and save the file. The read speed on my new class 10 card went from 5Mpbs to 15Mbps, BIG DIFFERENCE! Only problem with doing it this way is it changes back to 4 after a reboot. There if a flashable file in the post I got this info from ( http://forum.xda-developers.com/showthread.php?t=815557&page=19 ) but I haven't tried it. Apparently it is very easy to integrate... Enjoy the correct speeds for your card! Please visit the post to see who solved this issue, it surely wasn't me!
Click to expand...
Click to collapse
So if its 4 then leave it at 4? If its anything else change to 128? Is that right? Your post kind of contradicts itself which is why im asking. Thanks.

Anyone know what the true bandwidth for the EVO's stock 8GB card should be?
Using the stock card and the newest MIUI, I get 3MB/s write 5MB/s read.

Just tried the edit, class 10 wintec 32 GB card went from 5.5 to 11.5 read. Write stayed about 12. Excellent. Thanks!
Now how do we setup a scrip or something to make this permanent?
EVO Sent

lahma69 said:
I guess no one had really noticed, but there is a major flaw with the evo. The microsd read speed is severely limited. I just bought a new Patriot 32gb class 10 micro sdhc card, and the read speed was great on my pc, but on my evo it was getting stuck at 5Mbps oi tested with "sd card speed tester" while my write speed was correct at 11Mbps. I don't understand why all developers aren't integrating it into their roms/kernels , it doesn't make sense... All you have to do is use root explorer or some other root file manager and navigate to "/sys/devices/virtual/bdi/179:0/" and open the file "read_ahead_kb" with a text editor (with root explorer just long press the file and select "open with text editor", and if the value is anything other than 4, change it to 128 and save the file. The read speed on my new class 10 card went from 5Mpbs to 15Mbps, BIG DIFFERENCE! Only problem with doing it this way is it changes back to 4 after a reboot. There if a flashable file in the post I got this info from ( http://forum.xda-developers.com/showthread.php?t=815557&page=19 ) but I haven't tried it. Apparently it is very easy to integrate... Enjoy the correct speeds for your card! Please visit the post to see who solved this issue, it surely wasn't me!
Click to expand...
Click to collapse
Thanks for the tip.

good find, we need a flashable zip though

gtkansan said:
Just tried the edit, class 10 wintec 32 GB card went from 5.5 to 11.5 read. Write stayed about 12. Excellent. Thanks!
Now how do we setup a scrip or something to make this permanent?
EVO Sent
Click to expand...
Click to collapse
what did you change, my number is just a 4 there, nothing else

Wow! what a difference, thanks for this info, reading the desire forums it looks like they are making it permanent by editing the kernel, anyone know how to do this??

Just change 4 to 128
iitreatedii said:
what did you change, my number is just a 4 there, nothing else
Click to expand...
Click to collapse
EVO Sent

Interesting, i had the value 4, changed it to 128 but my write speed didn't change but read went from 5 -> 13 - also its listing my class 4 card as class 2 - hence 2mb/write booooooo

I have a 16GB Class 6 Card from Sandisk:
Original Test:read_ahead_kb = 4
Read Speed: 4MB/s
Write Speed: 5MB/s
Test 1:read_ahead_kb = 128
Read Speed: 18MB/s
Write Speed: 6MB/s
Test 2:read_ahead_kb = 64
Read Speed: 17MB/s
Write Speed: 6MB/s
Test 3:read_ahead_kb = 32
Read Speed: 13MB/s
Write Speed: 7MB/s
Test 4:read_ahead_kb = 16
Read Speed: 10MB/s
Write Speed: 7MB/s
Test 4:read_ahead_kb = 8
Read Speed: 6MB/s
Write Speed: 6MB/s
Thanks for the tip! Good info to have.

nsxla said:
Interesting, i had the value 4, changed it to 128 but my write speed didn't change but read went from 5 -> 13 - also its listing my class 4 card as class 2 - hence 2mb/write booooooo
Click to expand...
Click to collapse
That's what he said would change.
And OP, I'm still lost. You said if the value is anything but 4 change it to 128. Is there some reason we can't change it from 4 to 128?

Samsung 64GB SD Card - SO SLOW

So I ordered a Samsung 64GB Class 10 micro SD card, and it seems VERY slow.
While I gone so much mind the slowness, as I dont play a lot of games and would use it more for pictures and music I was wondering if I could get a few questions answered before I send it back or just give it to someone else.
1: Does the S4 have problems with 64GB cards?
- I am running Sacs KitKat V2
2: should I format with a format (NSFT/exFat) and is it better done on a Mac or PC?
3: what should the Unit Size be?
4: I just copied my old sd card on to this one, and some of the big games I do have stopped showing up. but when I put my old card back in, they are there again.
Why would this happen?
Thanks for the help everyone!

You have to format the card using the phone itself. Go into settings then storage and the option should be there. Try that, then re-copy your stuff to the card. If you still have problem then it is probably a dud card.
Sent from my SAMSUNG-SGH-I717 using xda app-developers app

You shouldn't re-format it at all from stock, but if you do you should try the official SD Formatter: https://www.sdcard.org/downloads/formatter_4/
I have a samsung 64GB microsd in my S4 and it's ridiculously fast according to SD Tools (http://i.imgur.com/EXUVIP7.png), probably a caching causing that; but anyways, it's great in normal use copying roms over/etc.

Oishikatta said:
...probably a caching causing that
Click to expand...
Click to collapse
LOL, you don't say! Divide those numbers by 10 and you have a more realistic speed indication :good:

Pfeffernuss said:
LOL, you don't say! Divide those numbers by 10 and you have a more realistic speed indication :good:
Click to expand...
Click to collapse
No, samsung does claim the card gets 70MB/s read and 20MB/s write - and the reviews on amazon match that even for the lower priced card:
http://www.amazon.com/Samsung-64GB-PLUS-Micro-Adapter/dp/B00I4ZMNY4/
Obviously the SD Tools benchmark isn't testing the actual card performance, but what matters is that in actual use the samsung cards are great.
Windows/crystaldiskmark can also easily be used to do a real test.
Here's in a usb 2.0 card reader:
Sequential Read : 23.455 MB/s
Sequential Write : 17.352 MB/s
Random Read 512KB : 22.898 MB/s
Random Write 512KB : 16.407 MB/s
Test : 100 MB [D: 32.1% (18.8/58.5 GB)] (x5)
Date : 2014/03/26 11:16:15
OS : Windows 8.1 [6.3 Build 9600] (x64)
If @chaos67731 isn't getting at minimum 10-20MB/s after formatting the card then there's probably something wrong with it.

chaos67731 said:
1: Does the S4 have problems with 64GB cards?
- I am running Sacs KitKat V2
2: should I format with a format (NSFT/exFat) and is it better done on a Mac or PC?
3: what should the Unit Size be?
4: I just copied my old sd card on to this one, and some of the big games I do have stopped showing up. but when I put my old card back in, they are there again.
Click to expand...
Click to collapse
1: A good amount of users (including me) had problems with their SD cards on S4s. The problems are between:
occasional unmount/remount (the system does this for no apparent reason). S4 cant read cards after a sudden unmount, and cards usually get killed. most of the cards reported are 16,32 and 64 GB micro SD kingstone. SandDisk has problems too but I'm not sure about Samsung's.
2: Just use the official SD formatter mentioned by @Oishikatta above.
3: if you used the official SD formatter you wont have to deal with Unit Size. (personally, I dont know what's that)
4: Do you use a card reader when you copy your memory card? or do you just connect the phone using a cable? try using a card reader when copying your SDs. Some hidden files may not appear if you used the cable.
I hope I helped and excuse my English, its not my native language.

Well if you have a SanDisk they want you to format exfat. http://kb.sandisk.com/app/answers/d...sion/L3RpbWUvMTM5NTg5ODI5OS9zaWQvRDdTTFVmUWw=

Oishikatta said:
No, samsung does claim the card gets 70MB/s read and 20MB/s write.
Click to expand...
Click to collapse
Sure, on a PC with an appropiate very fast SD-card reader. Using a phone you won't get those advertized speeds.
This is the result with a more proper SD-benchmarking app (although internal and external SD are shown in reverse):
These values will be more realistic. SD-Tools results (cached) don't mean jack, unfortunately.