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tldr/pages/linux/hd-idle.md

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# hd-idle
> Spin down external disks after a period of idle time.
> More information: <https://manned.org/hd-idle>.
- Start a service to manage hard drive spin down. By default hard disks will spin down after 10 minutes of inactivity:
`systemctl start hd-idle`
- Spin down a disk immediately:
`hd-idle -t {{/dev/sdX}}`
- Set disks to never spin down, then set explicit idle times (in seconds) for disks which have "sda" or "sdb" in their device name:
`hd-idle -i 0 -a /dev/sda -i {{300}} -a /dev/sdb -i {{1200}}`