When booting Linux from external device you may want to disable internal hard disk drive, you can disable your hard drive without removing your hard drive from your laptop/desktop PC.
Disable / Hot unplug SATA Drive
echo 1 > /sys/block/sda/device/delete
Enable / Scan SATA Devices
echo "- - -" > /sys/class/scsi_host/host0/scanPS: The hard disk drive may automatically power down when you disable it.
If you want to put your hard drive into standby / sleep state to save power, and it can automatically weak up when the system try to access it. You may try to use hdparm.
Put HDD into standby state
hdparm -y /dev/sda
Put HDD into sleep state
hdparm -Y /dev/sda
ATTENTION: When using hdparm command to put drive into standby/sleep state, the SATA drive may weak up if your system try to access this drive.
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