I want to buy an internal hard drive and an external enclosure to use for automated backups. Normally internal hard drives will automatically power down after a time interval specified in Windows' power management settings. Can something similar be configured for external hard drives and/or internal hard drives with external enclosures? It seems most of them have their own external AC power supply, but couldn't the OS theoretically send a command over USB instructing the drive to power up/down? Because this drive will only be used for backup purposes, I see no reason to have it running all the time. Ideally it would be powered down unless the backup script was running or I was manually accessing the drive. Is it possible to configure something like this?