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Benchmark your SSD or hard disk speed
Authored by: fracai on Jul 11, '12 07:44:16AM
That second command isn't going to measure the read speed of your disk at all. It's reading from /dev/zero and writing to /dev/null; both are virtual devices. The first command already wrote out a temporary file, so just read from that:
dd if=tstfile bs=1024k of=/dev/null count=1024
For a better view of disk performance, these commands should be run with varying block sizes (bs=) and the results plotted. This is left as an exercise for the reader.
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Benchmark your SSD or hard disk speed
Authored by: kirkmc on Jul 11, '12 07:59:51AM

Thanks. The submission had the same command twice, and as it was anonymous, I couldn't contact the poster. I did some Googling and found that second command. It seemed to work for me, but I've changed it in the hint.

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Mac OS X Hints editor - Macworld senior contributor
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