Sempre útil, time</code> in Unix along with dd</code> to randomly write on your HDD or SSD.
time dd if=/dev/zero bs=1024k of=tstfile count=1024
E também funciona para testar a velocidade de leitura:
time dd if=tstfile bs=1024k of=/dev/null count=1024
Via <a href=” http://www.cultofmac.com/180131/find-out-how-fast-your-ssd-or-hard-drive-really-is-os-x-tips/”> Culto de Mac </a>