Andy Green said: > Word of warning, I set -S 0 on an old laptop drive, it subsequently spun > down > immediately after each IO action :-) Not sure if that's par for the > course > or just a weird one but I now avoid -S 0. According to the man pages, a spin-down parm of zero means "off". Sounds like a bug you can report. lol, may be the guy that wrote the code thought "off" was referring to the drive and not the feature. ;-) In all likelihood, I'm sure it was (is?) just an oversight in decoding the parm. Values from 1-240 are multiples of 5 seconds, so I bet the code did a simple x multipled by 5, came up with zero seconds and said "that's the delay", instead of handling the special case of zero separately.