SATA hotswap

Hotswapping SATA drives, be it ODD or HDD, is easy on Linux.

To detect newly attached drive:
echo "0 0 0" > /sys/class/scsi_host/host?/scan"
(its permission is 200, write-only only to root)
The host? reflects SATA channel number.

To safely dismount the drive:
echo 0 > /sys/block/sd?/device/delete
The sd? is hdd's device identifier.

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Thanks to stephane kattorr@sakana.fr