====== Data recovery ======

<code bash>
hdparm -c0 /dev/sdi
hdparm -X1 /dev/sdi
hdparm -d0 /dev/sdi
echo 1 > /sys/block/sdi/device/queue_depth
</code>

===== fast erase whole disc =====

<code bash>
sudo hdparm --user-master u --security-set-pass ABC /dev/sdX
sudo hdparm --user-master u --security-erase ABC /dev/sdX

# check if device security is "not enabled"
hdparm -I /dev/sdX
</code>


====== sata hotplug  ======
===== Plug =====

<code bash>
echo 0 - 0 > /sys/class/scsi_host/host5/scan
</code>

Rescan all ports:
<code>
exec tee /sys/class/scsi_host/host*/scan <<<'- - -' >/dev/null
</code>
===== Unplug =====

<code bash>echo 1 > /sys/block/(whatever)/device/delete</code>