Table 133 Erase Unit Information - Hitachi HDS721050CLA362 Specifications

If the password does not match, then the device rejects the command with an Aborted error.
Word
00
01-16
17-255
Table 132
Erase Unit Information
Identifier Zero indicates that the device should check the supplied password against the user
password stored internally. One indicates that the device should check the given password
against the master password stored internally.
The Security Erase Unit command erases all user data and disables the security mode feature (device lock
function). So after completing this command, all user data will be initialized to zero with write operation. At this
time, it is not verified with read operation whether the sector of data is initialized correctly. Also, the defective
sector information and the reassigned sector information for the device are not updated. The security erase
prepare command should be completed immediately prior to the Security Erase Unit command. If the device
receives a Security Erase Unit command without a prior Security Erase Prepare command, the device aborts
the security erase unit command.
This command disables the security mode feature (device lock function), however the master password is still
stored internally within the device and may be re-activated later when a new user password is set. If you execute
this command on disabling the security mode feature (device lock function), the password sent by the host is
NOT compared with the password stored in the device for both the Master Password and the User Password,
and then the device only erases all user data.
The execution time of this command is set in word 89 of Identify device information.
HITACHI Deskstar & CinemaStar 7K1000.B & Deskstar E7K1000 Hard Disk Drive specification
Description
Control word
bit 0 : Identifier (1-Mater, 0-User)
bit 1 : Erase mode (1- Enhanced, 0- Normal)
Enhanced mode is not supported
bit 2-15 : Reserved
Password
Reserved
(32 bytes)
183