Reserved19-255
Master Password Revision Code
(valid if Word 0 bit 0 = 1)
17-18
Password ( 32 bytes )01-16
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
00
DescriptionWord
Figure 107. Security Set Password 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.
Security Level A zero indicates a High level, a one indicates a Maximum level. If the host sets
the High level and the password is forgotten then the Master Password can be
used to unlock the device. If the host sets the Maximum level and the user pass-
word is forgotten, only an Security Erase Prepare/Security Unit command can
unlock the device and all data will be lost.
Password The 32 bytes are always significant in the text of the password.
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 the Identify
Device word 92. The valid Revision Codes are 0000h to FFFDh. The Default
Master Password Revision Code is FFFEh. The code 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 pass-
word. 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 pre-
viously 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 pass-
word. 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).
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
158
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