# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 732 MB in 2.00 seconds = 365.20 MB/sec
Timing buffered disk reads: 114 MB in 3.05 seconds = 37.38 MB/sec
Substitute /dev/hda with the name of your disk device.
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source:http://linuxpoison.blogspot.com/2008/06/135781758019826.html