ATA Security Commands:
Most of these are VERY DANGEROUS and can destroy all of your data!
Due to bugs in older Linux kernels, use of these commands may even
trigger kernel segfaults or worse.  EXPERIMENT AT YOUR OWN RISK!

--security-freeze           Freeze security settings until reset.

--security-set-pass PASSWD  Lock drive, using password PASSWD:
                                  Use 'NULL' to set empty password.
                                  Drive gets locked if user-passwd is selected.
--security-unlock   PASSWD  Unlock drive.
--security-disable  PASSWD  Disable drive locking.
--security-erase    PASSWD  Erase a (locked) drive.
--security-erase-enhanced PASSWD   Enhanced-erase a (locked) drive.

The above four commands may optionally be preceded by these options:
--security-mode  LEVEL      Use LEVEL to select security level:
                                  h   high security (default).
                                  m   maximum security.
--user-master    WHICH      Use WHICH to choose password type:
                                  u   user-password (default).
                                  m   master-password