IBM DBCA-204860 Hard Drive Specifications - Page 145

Master Password Revision Code

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Word 00 01 16 17 18 19 255 Description Control word bit 0 : Identifier (1 Master, 0 User) bit 1 7 : Reserved bit 8 : Security level (1 Maximum, 0 High) bit 9 15 : Reserved Password (32 byte) Master Password Revision Code (valid if Word 0 bit 0 = 1) Reserved Figure 91. Security Set Password Information Identifier Zero indicates that 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 set with Master password. If Identifier is User, the Revision Code is not set. The Revision Code field is returned in Identify Device word 92. The valid Revision Codes are 0000h to FFFDh. Default Master Password Revision Code is FFFEh. F F F F h is reserved. 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 N O T 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 N O T be used to unlock the device. Identifier=Master / Security level = Maximum This combination will set a master password but will N O T enable the security mode feature (lock function). Command Descriptions 137

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Word
Description
00
Control word
bit 0
: Identifier (1
Master, 0
User)
bit 1 7
: Reserved
bit 8
: Security level (1
Maximum, 0
High)
bit 9 15
: Reserved
01 16
Password
(32 byte)
17 18
Master Password Revision Code
(valid if Word 0 bit 0 = 1)
19 255
Reserved
Figure 91. Security Set Password Information
Identifier
Zero indicates that 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 set with Master password.
If Identifier is User,
the Revision Code is not set.
The Revision Code field is returned in Identify Device
word 92.
The valid Revision Codes are 0000h to FFFDh. Default Master Password
Revision Code is FFFEh. FFFFh is reserved.
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 pass-
word.
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 pre-
viously 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).
Command Descriptions
137