I'm having issues with my micro SD card. Its a 16GB class 10.
I noticed lately that my benchmark tests the sd speeds are around - Writing 8.5 MB/s and Reading 14.6 MB/s.
This is far from normal values and other tests I have made.
I have formatted the card and preform several speed tests using my PC and the card is working perfect.
Minimum I got was writing 14.3MB/s and Reading 17.8MB/s.
All other values were superior.
So card is working well as always was, but apparently de benchmark results on mobile are showing very low values and far from a standard Class 10 values.
could there be a problem with my device?
Nope, as you noted in the MIUI thread, when you overclocked your device that copying increased in speed. The device just may not be able to keep up with the card to a certain extent.
But I always got higher values,e.g., writing above 12 and reading above 17 with this card in this device. Just now I started to have these low values.
My device just came from official repair due to a cashed screen and I'm getting suspicious they have done something. Is it possible?
Highly doubtful, maybe its just getting worn out?
Mines a A-data class 6 and it was writing at 8MB/s when I got it, now I'm lucky to get 4MB/s
The card is just 1 month old... Besides if I test it in my PC the results are just fine and normal
Is it possible to check another SD with same format? maybe from mates?
the tests I mad on my PC the results ar normal but I have tested my card in other phones, Samsung Galaxy S2 and Samsung Galaxy Ace and in both the results are horrible.
Samsung Galaxy Ace
Writing speed 6.4
reading speed 14.3
Samsung Galaxy S2
Writing speed 8.8
reading speed 15.4
What the **** is going on here that I can't find a common sense for this behavior?
Results are generally lower on phones when benching sd cards.
Did you try tinkering with sd-booster to increase your results?
but before I got normal results with phone benchamrks:
writing 12-15
reading always up 17
Using same phone and same card and the results got very poor.
If I test the sd on my PC the results are normal but in the device got very low
Firstly format your card with phones formatter then Download sd formatter on pc and format your card with it by putting it in sd card reader
Then test your sd card in phone again
Sent from my IDEOS X5 using xda premium
Speed on pc depends on settings. if write cache is enabled the speed is a lot improved. Mine in other hand with pc i got 4 times lower value than with my phone. It was les than 4MB/s of writing, but my laptop is 5 years old. but speed is kinda good anyway, but i'm using WinXP, and other ****ty newer windows versions i think uses write cache so the file physicly is not already written but windows shows it is...and if you pull card you'll get write delayed error... anyway..there is no 100% accurate method to test it..in home environment.
shantam said:
Firstly format your card with phones formatter then Download sd formatter on pc and format your card with it by putting it in sd card reader
Then test your sd card in phone again
Click to expand...
Click to collapse
thank you
Did this and actually inproved the writing speed of the card.
Several mobile Benchmark tests and values always around 11.1 and 11.9 but even then far from normal which is 14
One thing I also noticed and never mentioned. As higher the CPU OC lower the score of SD card writing. So 800mhz much better than 1.5Ghz and so on
transcend is the Best
Guys , i have been using a Transcend Class 6 card for past 2.5 years ..
No problems yet plus superb perfromance ...
Write speeds : 8-9 Mbps
Read :Around 14-15 Mbps...
I think its the winner in this category ...
So old thread...............
Sent from my U8800 using Tapatalk 2
Druida69 said:
This is far from normal values and other tests I have made.
Click to expand...
Click to collapse
...which are? When did the behaviour change (changing ROM or...)?
XphX
XphX said:
...which are? When did the behaviour change (changing ROM or...)?
XphX
Click to expand...
Click to collapse
You quote 7 months old post???
Sent from my U8800 using Tapatalk 2
Qqqxxxzzz said:
You quote 7 months old post???
Click to expand...
Click to collapse
It was ajithmemana bringing the post back from the dead - I did not have a look at the date.
XphX
Is there any problem answering to a 7 months old topic?
Should he start a new topic stating "I'd just like to reply to that a post on a old topic, so here it goes..."
LoL
VuDuCuRSe said:
Is there any problem answering to a 7 months old topic?
Should he start a new topic stating "I'd just like to reply to that a post on a old topic, so here it goes..."
LoL
Click to expand...
Click to collapse
No, but he asked question and quoted from "account currently disabled"-guy.
Sent from my U8800 using Tapatalk 2
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
That's basically because it's a myth .
I'm kidding, I don't know if it is or not, but personally, I didn't notice any speed difference or improvement. I tried different ROMs, they all behaved as if they were on NAND. I have the same card as you do.
Someone told me once: "It's because you have a UHS card, HD2 doesn't support them so the speed is degraded".
I am not sure of that, but there was no apparent improvement over NAND installation.
+1, I never saw any speed difference. My guess is that since it would theoretically be faster there was a placebo effect and people actually felt their phones being faster. The same thing happens with build.prop tweaks and the entropy seed generator, both of which had great comments but no actual effect on my phone.
x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
You should read first my friend,this way you will save some Money,any Sandisk class 4 will be faster than any class 10 in native sd, simply because with a class 10 card you get high sequential data transfer and very low random data transfer, and that is the secret random access transfer rate.
But the manufacturers won't tell you the random access speeds, you have to test.
Use crystal disk mark to test the sd and check for the last 2 values..
And read..and search..
Sent from my GT-I9300 using xda premium
x_max_best said:
i have bought a new Sandisk Ultra 16GB class 10 card and flash nexushd2 rom in native sd but i notice no different than nand in the speed !!!
i test the card with h2testw_1.4 and it was ok the speed was 10mb R/W,
So Where is the Speed that everyone talk about !!!!
Click to expand...
Click to collapse
I can confirm that the problem is with the Sandisk Ultra SD Card. I had good read but very poor write speeds on a Sandisk UHC which caused all sorts of problems. I changed to a Samsung Class 10 32Gb card and the difference is very noticeable The Sandisk gave a write speed of about 3/4 Mbs and a read speed of about 15 Mbs. The Samsung now gives a write speed of 9.7 and a read speed of 20.15. Both tested with a cache size of 2048Kb.
sandymac said:
I can confirm that the problem is with the Sandisk Ultra SD Card. I had good read but very poor write speeds on a Sandisk UHC which caused all sorts of problems. I changed to a Samsung Class 10 32Gb card and the difference is very noticeable The Sandisk gave a write speed of about 3/4 Mbs and a read speed of about 15 Mbs. The Samsung now gives a write speed of 9.7 and a read speed of 20.15. Both tested with a cache size of 2048Kb.
Click to expand...
Click to collapse
I had the same low write speed in native SD (3 mb), but i flash the rom again in DataonExt mod and the speed of write was 7 mb and i feel some speed up in apps (not in the rom) Rom toolbox collect data faster , I think there is something wroung with Native SD ,the speed of write should be higher than 3mb
Edit: it was a placebo effect , there is no speed up in DataonExt , i test the same app in Nand
x_max_best said:
I had the same low write speed in native SD (3 mb), but i flash the rom again in DataonExt mod and the speed of write was 7 mb and i feel some speed up in apps (not in the rom) Rom toolbox collect data faster , I think there is something wroung with Native SD ,the speed of write should be higher than 3mb
Click to expand...
Click to collapse
Well, if you looked, I am on Native SD and generally manage around the 10Mbs write with 20Mbs read so nothing wrong with Native SD.
as the creators of nativeSD and others have pointed out, it's all down to the small block size random read/write speed, that's what most read/writes are when running an OS, small and random.
While reading (for example) a video, it will read bigger, almost certainly sequential, block sizes.
The industry quoted max speed of a card is almost always based on the largest block size, usually read, always sequential speed, so a class 10 can read large block sizes at 10meg, however, test the card for all different block sizes and you'll see that small random r/w's are wayyyyy slower, massively so, often on the order of a factor of 1000 slower.
In general, the lower class cards actually beat the class 10s, often by a large factor, so the rom running from it feels snappier and more responsive than on a class 10.
Check out the (admittedly over a year old, but still a good example) comparison charts HERE, and note especially the 4th and 5th charts, where the class 4 blows the others down by over a factor of 100
http://www.tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html
samsamuel said:
as the creators of nativeSD and others have pointed out, it's all down to the small block size random read/write speed, that's what most read/writes are when running an OS, small and random.
While reading (for example) a video, it will read bigger, almost certainly sequential, block sizes.
The industry quoted max speed of a card is almost always based on the largest block size, usually read, always sequential speed, so a class 10 can read large block sizes at 10meg, however, test the card for all different block sizes and you'll see that small random r/w's are wayyyyy slower, massively so, often on the order of a factor of 1000 slower.
In general, the lower class cards actually beat the class 10s, often by a large factor, so the rom running from it feels snappier and more responsive than on a class 10.
Check out the (admittedly over a year old, but still a good example) comparison charts HERE, and note especially the 4th and 5th charts, where the class 4 blows the others down by over a factor of 100
http://www.tomshardware.com/reviews/microsdhc-memory-card-performance,3011-12.html
Click to expand...
Click to collapse
yugoport said:
You should read first my friend,this way you will save some Money,any Sandisk class 4 will be faster than any class 10 in native sd, simply because with a class 10 card you get high sequential data transfer and very low random data transfer, and that is the secret random access transfer rate.
But the manufacturers won't tell you the random access speeds, you have to test.
Use crystal disk mark to test the sd and check for the last 2 values..
And read..and search..
Sent from my GT-I9300 using xda premium
Click to expand...
Click to collapse
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
x_max_best said:
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
Look at my scandisk class 2 32 gb below, in the last field at right is basically more than 30 times faster than yours in the random write..
https://www.dropbox.com/s/bgbm6tcv99a1r7j/scandisk class 2 32 gb.JPG
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
The random write speed is to low! Look by "write 4k" and "write 4k/QD32".
Look here, the second ranking is importand for us:
http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172
And here from XDA:
http://forum.xda-developers.com/showthread.php?t=1150369
x_max_best said:
This is crystal disk mark for my SD Card , See it and tell me where exactly the problem !!
Click to expand...
Click to collapse
as already noted 4k and 4kqd32 (qd32 = there are 32 or more write operations in the queue, probably quite common when running an operating system) speeds are atrocious, thats gonna be your real speed, more often than not, somewhere between 38K/sec and 0.6MB/sec,,, a world away from 10MB/sec. Course, oftentimes the system is reading those small blocks, not writing, which is faster so you can probably make a rough estimate of total average r/w at around 2MB/sec, still a long way from 10MB/sec
yugoport said:
Look at my scandisk class 2 32 gb below, in the last field at right is basically more than 30 times faster than yours in the random write..
https://www.dropbox.com/s/bgbm6tcv99a1r7j/scandisk class 2 32 gb.JPG
Click to expand...
Click to collapse
Fietz said:
The random write speed is to low! Look by "write 4k" and "write 4k/QD32".
Look here, the second ranking is importand for us:
http://forums.whirlpool.net.au/forum-replies.cfm?t=1582172
And here from XDA:
http://forum.xda-developers.com/showthread.php?t=1150369
Click to expand...
Click to collapse
Your Conclusion is wroung , i retest my card with CrystalDiskMark and the result was interesting (attachment) ,and all i did to get this result is change the test size to 50 mb , i start to believe that there is noting called fast Native SD , it is just placebo effect.
if you want me to believe u ,provide a video in Youtube for the fast Native SD that u have and let me know what do u mean by fast Native SD
x_max_best said:
Your Conclusion is wroung , i retest my card with CrystalDiskMark and the result was interesting (attachment) ,and all i did to get this result is change the test size to 50 mb , i start to believe that there is noting called fast Native SD , it is just placebo effect.
if you want me to believe u ,provide a video in Youtube for the fast Native SD that u have and let me know what do u mean by fast Native SD
Click to expand...
Click to collapse
I don't need to prove anything..if you think it's not fast or it doesn't suits you use nand.. I have more important things to do..
Sent from my GT-I9300 using xda premium
Would someone with an an XZ2 Premium please run a storage speed test on the Micro SD card slot? The XZ2 is apparently gimped compared to last year's XZ1. Which is a real shame.
SD speeds seem pretty bad.
Using A1 SD Bench, running the "accurate w/reboot" test, it achieved only 19.26MB/s read and 21.52MB/s write.
This was with the latest Samsung EVO 128GB U3 card capable of near 100MB/s reads and almost 90MB/s writes as tested on my PC using USB3 (https://www.amazon.com/gp/product/B06XWZWYVP).
Dismal.
jaytee23 said:
SD speeds seem pretty bad.
Using A1 SD Bench, running the "accurate w/reboot" test, it achieved only 19.26MB/s read and 21.52MB/s write.
This was with the latest Samsung EVO 128GB U3 card capable of near 100MB/s reads and almost 90MB/s writes as tested on my PC using USB3 (https://www.amazon.com/gp/product/B06XWZWYVP).
Dismal.
Click to expand...
Click to collapse
Same for me, I also checked my EVO Plus U3 Card on my PC and it was fine, so there does seem to be an issue, the internal memory speed is insanely fast
Geoffxx said:
Same for me, I also checked my EVO Plus U3 Card on my PC and it was fine, so there does seem to be an issue, the internal memory speed is insanely fast
Click to expand...
Click to collapse
There's an issue, alright. The issue is that they implemented a pathetic SD card subsystem in an expensive, super-premium phone. It's no wonder that it took so long to generate thumbnails for the photos I transferred over - the SD card read speed (and write speed) is thoroughly gimped.