SD Card Throughput exceeds - On using "dd" command

[Leon Goldstein]

amio wrote:

>Hi All,
>Am using dd command to find throughput of my SD card.
>After mounting the sd card, i run,
>
>time dd if=/dev/zero of=/mnt/sdcard/Myfile.txt bs=512
>count=20480;umount /mnt/sdcard;
>20480+0 records in
>20480+0 records out
>10485760 bytes (10 MB) copied, 0.0658825 s, 159 MB/s
>
>real    0m0.097s
>user    0m0.013s
>sys     0m0.055s
>
>But the throughput shown exceeds the throughput of SD specification.
>Can anyone comment on this??
>
>Thanks,
>Amio
>
>  
>
I'd be a bit cautious about running such tests on a USB or other static 
RAM memory device.  These have a finite write limit, and conducting 
thousands of test writes will probably shorten the device's service life.

-- 
Leon A. Goldstein

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