Hi all, I issued the following command in crontab. However, the light of my hard drive on every 1 to 2 seconds. It seems doesn't work. So, how can I spin down the hard drive every 3 minutes? */3 * * * * root /sbin/hdparm -y /dev/hda I also tried the following but the light of my hard drive still on every 1 to 2 seconds. Moreover, the command issued with no error message and it says standby for 3 minutes. # /sbin/hdparm -S36 /dev/hda Thanks. Samuel -- There was a small company called SCO That wanted our Linux to go They sued all through the night Without proving they're right And soon they'll have no more dough! by Paul Hudson, Linux Format Reviews Editor