recommended micro sd card ?

[NondescriptMember]

I just loaded the newest Android image to this new card.  Very stable

Isn't it funny that using an SD card with ultra slow random writes even leads to Android behaving unstable and that problems are gone when using any recommended SD card that shows high random I/O performance?

And still only bullshit recommendations like 'speed at least class 10' available in Pine64 wiki leading to all sorts of troubles for their users. But why should this change? Why spending a minute on improving documentation when their users can waste hours and hours of their live due to missing/wrong recommendations.

BTW: With the 16GB test something clearly went wrong and you should keep in mind that when the card is used inside Pine64 the board's SDIO implementation limits sequential transfer speeds anyway to 23MB/s max. All the numbers here also apply to Pine64: http://forum.armbian.com/index.php/topic...rformance/

Yes, I would have preferred to not have had to go through that.  Thank you again for all your help!

[benpope81]

I can't see any tests here that have been run on the Pine64+ 2GB, so here goes: Samsung EVO 64GB (MB-MP64D):

Code:

ubuntu@pine64:~/development$ git clone https://github.com/hglm/flash-bench.git
ubuntu@pine64:~/development$ cd flash-bench/
ubuntu@pine64:~/development/flash-bench$ make
ubuntu@pine64:~/development/flash-bench$ sudo ./flash-bench 
Using test file flash-bench.tmp (using all 512MB).
Benchmark: Sequential read  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 23.64s (21.66MB/s), CPU: user 0.01%, sys 0.99%
Benchmark: Sequential write  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 31.47s (16.27MB/s), CPU: user 0.02%, sys 1.09%
Benchmark: Random read  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 40.83s (12.54MB/s), CPU: user 0.02%, sys 1.17%
Benchmark: Random write  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 52.24s (9.80MB/s), CPU: user 0.01%, sys 0.80%


ubuntu@pine64:~/development$ wget http://www.iozone.org/src/current/iozone3_434.tar
ubuntu@pine64:~/development$ tar xvf iozone3_434.tar
ubuntu@pine64:~/development$ cd iozone3_434/src/current
ubuntu@pine64:~/development$ make linux-arm
ubuntu@pine64:~/development$ sudo iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
...
Include fsync in write timing
O_DIRECT feature enabled
Auto Mode
File size set to 102400 kB
Record Size 4 kB
Record Size 16 kB
Record Size 512 kB
Record Size 1024 kB
Record Size 16384 kB
Command line used: ./iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024k -r 16384k -i 0 -i 1 -i 2
Output is in kBytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 kBytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
                                                              random    random     bkwd    record    stride                                    
              kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
          102400       4     3123     3979     9709     9702     9697     4102                                                                
          102400      16    10940    12180    16150    16149    16167    12121                                                                
          102400     512    21655    21753    23216    23217    23216    21627                                                                
          102400    1024    21814    21794    23199    23202    23203    21834                                                                
          102400   16384    21868    21851    23219    23217    23217    21914        

[jl_678]

The test and result is super helpful. Thank you! It shows me that my card sucks. No surprise really, I am replacing it with an EVO.

[Bob123456789]

Does any data exist comparing the SD cards that come with the Pine A64 to the others that have been tested here?

[BeerSnob]

Does any data exist comparing the SD cards that come with the Pine A64 to the others that have been tested here?

Yes, see data below:



Data for included SD card from Pine.

- It SUCKS!

- End of data.

[Bob123456789]

Thanks BeerSnob.

The hyperlink you included doesn't work. Can you post it again?

[BeerSnob]

Thanks BeerSnob.

The hyperlink you included doesn't work. Can you post it again?

Sorry Bob, I was being snarky/sarcastic ....there is no link. 

[Bob123456789]

Sorry for not picking up on that!

It just seems that we have 5-6 different cards tested and can compare them but none are the one that is provided by the board maker.

[tllim]

Sorry for not picking up on that!  

It just seems that we have 5-6 different cards tested and can compare them but none are the one that is provided by the board maker.

Based on the Sunxi, Armbian, and Pine64 community, highly recommended to use Samsung 32GB EVO Plus microSD card.

[Bob123456789]

If I were making the decision today that would be the best available information.

I have already purchased two cards from Pine and am looking for data comparing the performance of the Pine supplied cards to the others.

That way I understand the performance hit I take using the Pine cards.