Customizing hard disk spin-down times - CNET
When this setting is enabled, the system changes the power management system to turn off the disks after 10 minutes of use. When the option is unchecked, the disks are set to never turn off. Despite the limits in the control panel, this behavior can be changed manually, by using the "pmset" command in Terminal. The command alters the power management settings, giving users fine-tune control of the disk sleep settings. It also can set the display and system sleep times (though, the sliders work pretty well for those), and what behaviors will cause the computer to sleep and wake (lid opening, wake-on-LAN magic packet via Ethernet, and so on). For specific information on using this command, review its manual page on it by typing "man pmset" in the Terminal.
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