spin down

Hdparm –S <> /dev/

For example : SATA HD mount at /dev/sda1 ,you want SATA HD into sleep after 1 min

You need type command “hdparm –S 12 /dev/sda1”

reference:

http://yenjinc.info/?p=60

http://www.gentoo.org/doc/zh_tw/power-management-guide.xml