Spin down disks - no longer working

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http://forums.fedoraforum.org – One of the nice features of recent Fedoras is that the power managers allows you to spin-down disks when unused. This has been a real power/heat/noise savings. However sometime in the past few weeks this feature has ceased to work as expected. I have a backup drive (/dev/sdc) this is only used for one period at night, and the normally when I do an "ls -l /backup' (the mountpoint) in the day the drive has to spinup for 3-5 seconds before I get a result. No longer the case - it's always spinning. In XFCE power manager, under the "On AC" tab, I have the "Spin down hard (HowTos)