Policy
Turn Off the hard disk (plugged in)
This policy setting specifies the period of inactivity before Windows turns off the hard disk. If you enable this policy setting, you must provide a value, in seconds, indicating how much idle time should elapse before Windows turns off the hard disk. If you disable or do not configure this policy setting, users can see and change this setting.
PackMicrosoft Windows
CategorySystem / Power Management / Hard Disk Settings
Policy ID
39d84ca2b93cInternal name
DiskACPowerDownTimeOut_2Registry
Copy registry mappings
HKLM\Software\Policies\Microsoft\Power\PowerSettings\6738E2C4-E8A5-4A42-B16A-E040E769756E\ACSettingIndexPolicy notes
This policy setting specifies the period of inactivity before Windows turns off the hard disk. If you enable this policy setting, you must provide a value, in seconds, indicating how much idle time should elapse before Windows turns off the hard disk. If you disable or do not configure this policy setting, users can see and change this setting.