Posts tagged micro sd

Benchmarking micro SD cards
posted on 2015-04-15 01:28:41

Benchmarked some SD-cards, all which were of U1 standard, according to the print on each one.

speed in theory

The speeds mentioned on the packaging were:

  1. read ??mb/s, write ??mb/s
  2. read 90mb/s, write 50mb/s
  3. read 95mb/s, write 90mb/s

first card reader

[root@jerrylee /home/jl]# hdparm -t /dev/sdc
/dev/sdc:
 Timing buffered disk reads:  44 MB in  3.12 seconds =  14.12 MB/sec

[root@jerrylee /home/jl]# dd if=/dev/zero of=/dev/sdc bs=512 count=10000
10000+0 records in
10000+0 records out
5120000 bytes (5.1 MB) copied, 2.08556 s, 2.5 MB/s

[root@jerrylee /home/jl]# hdparm -t /dev/sdc
/dev/sdc:
 Timing buffered disk reads:  58 MB in  3.11 seconds =  18.68 MB/sec

[root@jerrylee /home/jl]# dd if=/dev/zero of=/dev/sdc bs=512 count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB) copied, 11.421 s, 4.5 MB/s

[root@jerrylee /home/jl]# hdparm -t /dev/sdc
/dev/sdc:
 Timing buffered disk reads:  58 MB in  3.10 seconds =  18.70 MB/sec

[root@jerrylee /home/jl]# dd if=/dev/zero of=/dev/sdc bs=512 count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB) copied, 11.5068 s, 4.4 MB/s

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