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Enable/disable Energy Saver's disk sleep
Authored by: mattmoss on Oct 14, '08 01:21:00PM
I found that an external FW800 hard drive I have (used only for Time Machine) was being put to sleep by the OS, only to be awoken 5 minutes later by the OS. The hard drive is usually quiet except when it spins up, and this periodic noise was rather annoying (and I don't imagine is all that good for the disk either, to be spun down and back up every 10 minutes).

Turning off Energy Saver's control of disk sleep (via System Prefs) didn't help... It worked great while using the iMac, but for some reason when I put the machine to sleep, it would wake up within 10 minutes, presumably because the drive was no longer being put to sleep. (Don't know why that should happen, but it does.)

I tried tinkering with the disksleep parameter of pmset, to change the interval, but with no better results.

Now, I have modified the rc.sleep and rc.awaken scripts from SleepWatcher to run pmset -c disksleep 10 (rc.sleep) and pmset -c disksleep 0 (rc.awaken). Everything seems happy!

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