[UPDATE] If your BIOS supports the AHCI standard, you may try to turn it on, and try to use the ‘hdparm -S1 /dev/sdn’ command again, or all the variants your distro suggests for powering down your hard disk.
BUT! Read here carefully about possible complications: http://en.wikipedia.org/wiki/Advanced_Host_Controller_Interface. If you don’t have such an BIOS switch or it doesn’t work for you for other reasons, you may read ahead.[/UPDATE] Continue reading “How to spindown(sleep) a SATA hard disk drive after being idle (Linux)”