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Old December 28th, 2012, 09:34 AM   #1 (permalink)
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Default Tab 2 slow external card speed

Hi - My wife and I bought two P3113s for Christmas. Her's seems faster when accessing anything stored on the extSdCard (off-line maps, music, movies, books, etc).

I installed SD Card Tester and was surprised by the performance results on the external sd cards.

Tablet 1, card 1: write speed= 6.1MB/s read speed= 14.9MB/s (avg of 3 tests)
Tablet 1, card 2: write speed= 5.9MB/s read speed= 14.7MB/s

Tablet 2, card 1: write speed= 5.7MB/s read speed= 5.7MB/s (avg of 3 tests)
Tablet 2, card 2: write speed= 5.6MB/s read speed= 5.9MB/s (avg of 3 tests)

Regardless of the card used, Tablet 2's read speed is much slower. I reformatted each card in Tablet 2, re-ran the tests and had the same result.

Can anyone tell me, Is my tablet slow or is my wife's tablet exceptionally fast?

If someone else wants to try this, here is how I did the test.
1. Install SD Card Tester (free) from Play Store
2. Go to Task Manager then Ram manager and press Clear Memory
3. Start SD Card Tester
4. Set path to /mnt/exSdCard
5. Leave file size set to 300MB
6. Press Start Test and wait for completion
7. Write speed is on the left, read speed is on the right
8. Run test two more times and average times

Any help would be appreciated.



Technical notes:
- Both tablets are running 4.0.4 (UEBLH2)
- Both cards are Sandisk Ultra 32GB class 10, UHS-1
- In SD Card Tester, the path was /mnt/exSdCard using a 300MB file size (using larger files gave the same result - it just took longer to complete each test)

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Old December 28th, 2012, 11:59 AM   #2 (permalink)
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I get 3.21MB/s write and 6.39MB/s read on my slower 8gb class 4 card, which I'm now considering upgrading. :P

Have you thought about a factory reset?
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Old December 29th, 2012, 03:36 AM   #3 (permalink)
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Ever tab may have different speed, may also depend on other running apps.
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Give me some MB's http://db.tt/IzxPvtOl
Samsung galaxy S3 GT-I9300 Running Stock Jelly Bean 4.1.2
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Old December 29th, 2012, 04:23 PM   #4 (permalink)
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Quote:
Originally Posted by Mackinon View Post
Ever tab may have different speed, may also depend on other running apps.
His read speed variation of 5.9 mbs to 14.7 mbs from one Tab to the other is not within the range i'd expect or accept as normal.
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Old December 29th, 2012, 05:28 PM   #5 (permalink)
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I factory reset tablet 2 - no change at all. This seems to be a hardware issue.

I'm beginning to wonder how many Samsung Tab 2 7.0 tablets can actually take advantage of the class 10 speed. A friend brought a third unit over and it could only go 6..7MB/s!

Anyone else actually measure the performance with a class 10 card?
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Old December 29th, 2012, 05:43 PM   #6 (permalink)
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Quote:
Originally Posted by Mackinon View Post
Ever tab may have different speed, may also depend on other running apps.
Some spread is expected. I would expect a variation of 1 - 3MB/s. However, the test is designed to minimize variation by using Task Mgr to stop background apps.

These two tablets have the same exact apps loaded, run same OS and one is constantly 3 times faster.

I beginning to.wonder how many other units can read more than 7MB/s?
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Old December 29th, 2012, 06:26 PM   #7 (permalink)
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Quote:
Originally Posted by BVote View Post
Some spread is expected. I would expect a variation of 1 - 3MB/s. However, the test is designed to minimize variation by using Task Mgr to stop background apps.

These two tablets have the same exact apps loaded, run same OS and one is constantly 3 times faster.

I beginning to.wonder how many other units can read more than 7MB/s?
I ordered your card, so I'll find out how fast (or slow) mine is in a few days.
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Old December 31st, 2012, 12:59 PM   #8 (permalink)
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Just received my Sandisk Ultra 32GB class 10 UHS-1, this one:

Amazon.com: SanDisk Ultra 32 GB MicroSDHC Class 10 UHS-1 Memory Card with Adapter (SDSDQU-032G-AFFP-A): Electronics

Speeds average:

Write = 7.22 mbs
Read = 6.29 mbs

I reformatted the new card with a Windows app called SD Formatter (v3.1), no change at all in the results.

Incidentally, your read speed average of 14.8 mbs is exactly what I get when I test /mnt/sdcard, not extSdCard.
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Old January 1st, 2013, 10:39 AM   #9 (permalink)
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jwither - With 20+ years of computer experience, I try very hard to be exact and consistent. With that being said, I think I may be a moron.

I heard the last thing you said and went back to make sure I was not that dumb. Both of my tablets gave the same range of external card read speed - 6.3 - 6.7MB/s. Apparently, I am. I can not duplicate the 14+ MB/s on the external card.

All three of the P3113s I tested gave consistent 14 - 15MB/s read speed on the internal memory. I think Samsung used a class 10 memory for the internal memory, but the access for the external card is clearly different (buffer size, PIO versus DMA - something).

However, I think we can say I screwed up on this one and move on...

Sorry...
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Old January 31st, 2013, 06:54 PM   #10 (permalink)
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I am trying to copy 3 video files totaling 14.1 GB to my Tab's 32 GB memory card (14 Transcend Class 4 memory card from Amazon) and the estimated time is 1 hour 40 minutes. It seems to be taking that long, too.

Copying to the internal memory isn't too much quicker.

Nothing is running on the PC or tablet that would slow the process.

Something can't be right, surely?
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