Test disk speed
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Disk
Linux
Performance
Last update
2018-02-22
2018
02-22
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# read speed
hdparm -t -T /dev/sda

# write speed: file on filesystem
dd if=/dev/zero of=/tmp/output conv=fdatasync bs=1M count=100; rm -f /tmp/output

# write speed on disk/partition (destructive!)
dd if=/dev/zero of=/dev/sdXY conv=fdatasync bs=1M count=100

Source: AskUbuntu