Hitachi HDS723020BLA642 - Table 131 Security Set Password Information

Hitachi hard disk drive specifications
189
Word
Description
00
Control word
bit 0
: Identifier (1-Mater, 0-User)
bit 1-7
: Reserved
bit 8
: Security level
(1-Maximum, 0-High)
bit 9-15
: Reserved
01-16
Password (32 byte)
17
Master Password Revision Code
(valid if Word 0 bit 0 = 1)
18-255
Reserved
Table 131 Security Set Password Information
Identifier
Zero indicates that the device regards Password as User Password. One indicates
that device regards Password as Master Password.
Security Level
Zero indicates High level, one indicates Maximum level. If the host sets High level
and the password is forgotten, then the Master Password can be used to unlock the
device. If the host sets Maximum level and the user password is forgotten, only an
Security Erase Prepare/Security Unit command can unlock the device and all data
will be lost.
Password
The text of the password – all 32 bytes are always significant.
Master Password
Revision Code
The revision code field is returned in the IDENTIFY DEVICE word 92.
The valid revision codes are 0001h through FFFEh. The device accepts the
command with a value of 0000h or FFFFh in this field, but does not change Master
Password Revision code.
The setting of the Identifier and Security level bits interact as follows.
Identifier=User / Security level = High
The password supplied with the command will be saved as the new user password. The security mode feature
(lock function) will be enabled from the next power on. The file may then be unlocked by either the user
password or the previously set master password.
Identifier=Master / Security level = High
This combination will set a master password but will NOT enable the security mode feature (lock function).
Identifier=User / Security level = Maximum
The password supplied with the command will be saved as the new user password. The security mode feature
(lock function) will be enabled from the next power on. The file may then be unlocked by only the user
password. The master password previously set is still stored in the file but may NOT be used to unlock the
device.
Identifier=Master / Security level = Maximum
This combination will set a master password but will NOT enable the security mode feature (lock function).