class 10 sd card slow write speed

**stockkid07** · 07-14-2011, 12:07 PM

Anyone else notice slow write speeds on their sd card? I got a PNY 32gb class 10 sd card and get 7 or 8mb write speed. Read speed is about 20mb/s. Used three different benchmarks and got same results. Is it my card or does the EVO 3D hardware not able to utilize the full speed. I remember the og Evo having a problem like this.

**jdizzle316** · 07-14-2011, 12:36 PM

yea, i have a 32 class 10 (ADATA brand) and i only get about 9-10 write speeds....17 for read

**canteenboy** · 07-14-2011, 01:44 PM

I have the 16GB PNY Class 10 from Best Buy. With SD Tools I got 11MB/s write and 20MB/s read.

**stockkid07** · 07-14-2011, 03:00 PM

Did u guys format it when u first got it? I did fat32 and did 64kb allocation rather than the 32kb that the default is on.

**roark1138** · 07-14-2011, 09:43 PM

I'm using the Lexar class 10 and get 9 write and 20 read

**stockkid07** · 07-15-2011, 12:52 AM

This is disturbing as the MINIMUM for class 10 is 10 MB/s write and about 20 MB/s read. Reading seems to be fine. But these card should be getting at least 13-15 write. And they are below even the minimum the card is supposed to be. Anyone run benchmarks on their card while it was out of the evo 3d or perhaps in another phone? Hopefully if its software issue it can be resolved.

**playersnoopy** · 07-15-2011, 01:08 AM

Why should the cards be getting 13-15, when minimum requirement is 10... the cheaper the cards, the more assured you can be that it will only get the minimum. The PNY I have is 66x so I know what to expect, but not like it's going to affect the EVO, the phone shouldn't be doing much IO after initial loads minus any big games. Which is why the stock card that comes with the phone is class 4. The only downside should be copying large movies onto the phone.

**stockkid07** · 07-15-2011, 01:47 AM

I say between 13-15 cause that's about average of what I see for class 10. I have never had a sd card meet only the minimum yet alone fail below it. I have has class 2 sandisk writing at 6mb/s. I'm not saying it should be between 13-15. But my main point is it shouldn't be below the minimum. I have had PNY before so I don't think its the card. I may need to do more tests to verify that. But if other people have the same problem it could be software. I would say maybe the evo 3d just doesn't fully utilize class 10 speeds but I believe someone has reported above 10mb/s. I would also say it could be allocation size as I thought I read 64kb helps improve the speed of the card compared to 32. I formatted the card right when I got it. I should set it to 32 and see how it performs.

**evo4gMN** · 07-15-2011, 07:26 AM

is there an app I can use to test my read and write speed?

**stockkid07** · 07-15-2011, 01:04 PM

Yeah I used three of them. One is sd tools, another is antutu benchmark, and the third is androbench. They are all in market place. The antutu is my favorite. It tests cpu, graphics, and ram, as well as Internal storage and sd card speed and compares it to other phones. Of course lots of the others tested and uploaded have been rooted. But its still neat the kind of database they have.

**bobodobo** · 07-15-2011, 02:54 PM

I have an AData 32GB Class 10 micro SDHC. I didn't reformat it before using. 17.1 MB/s read, 10.5 MB/s write according to .

**stockkid07** · 07-16-2011, 12:17 AM

Hmmmm interesting. We r getting below the minimum or barely meeting it. Hope more people post.

**mdallen5** · 07-17-2011, 08:12 AM

My transcend 16gbs class 6 reads at 10.3mbs and writes at 13.9mbps.

**playersnoopy** · 07-17-2011, 02:35 PM

Judging from the sound of things everything seems about right for the most part. Class 10 micro are still new and will probably always meet only the minimum specs. As for getting scores just below 10MB/s well that's probably your test program and your card having been used. A ###x speed rating is a little more accurate in your actual speed unless the vendor writes the read speed as the x-rating which happens with some vendors. And no what you got on Class 4 or 6 is not and should not be equivalent to Class 10 in performance ratios.

**cp1024** · 12-27-2011, 01:16 PM

if this is a problem for you, then it seems you may want to purchase another class 10 labeled card, also keep in mind that 10MBps write is measured while writing contiguous sequences, this will be affected by contents of the card, and which parameters were selected when you had formatted.

**moosc** · 12-27-2011, 01:32 PM

Do remember and its been documented countless times. The android os isn't set to run anything above class 6. The only real benefit is using class 10 is transferring files on the pc

Sent from my Galaxy Nexus using Tapatalk

**Led Zappa** · 12-27-2011, 03:32 PM

Originally Posted by moosc

Do remember and its been documented countless times. The android os isn't set to run anything above class 6. The only real benefit is using class 10 is transferring files on the pc

Sent from my Galaxy Nexus using Tapatalk

Do you have a link to this info and/or know if ICS will increase this limit?

**Saneless** · 12-27-2011, 05:41 PM

Something else to consider.. A lot of class 10 cards are good at writing normal/large files in sequence, but utterly blow at small, random access speeds.

I had to sell off a "Class 10" card because its random 4k tests were .008 MB/s. yes, less than even 1. I had a LOT of issues with my EVO 3D related to lag that I just figured was all the phone's fault. Turns out it was just the card.

I went with a Sandisk Class 4 and haven't had any issues since.

This is a good read on this problem.

**moosc** · 12-27-2011, 06:07 PM

On ics I have no idea. We need jerry to answer that. He had a good article on SD cards awhile back

Originally Posted by Led_Zappa

Do you have a link to this info and/or know if ICS will increase this limit?

Sent from my Galaxy Nexus using Tapatalk

**Led Zappa** · 12-27-2011, 08:12 PM

Originally Posted by Saneless

Something else to consider.. A lot of class 10 cards are good at writing normal/large files in sequence, but utterly blow at small, random access speeds.

I had to sell off a "Class 10" card because its random 4k tests were .008 MB/s. yes, less than even 1. I had a LOT of issues with my EVO 3D related to lag that I just figured was all the phone's fault. Turns out it was just the card.

I went with a Sandisk Class 4 and haven't had any issues since.

This is a good read on this problem.

I gotta say I won't argue with the test results or your experience, but I just got the Lexar 32GB Class 10 and have had no problems or noticed a difference/lag in any apps I use. I'll definitely report back if that changes.

**Saneless** · 12-27-2011, 10:06 PM

It might just depend on what apps use a lot of caching to it. Plume and Foursquare do, lots of little pictures, and run horribly. Music and movies are just fine, and large files copy quicker as well on the class 10.