Figure 100. Security Set Password Information - IBM DJSA-210 - Travelstar 10 GB Hard Drive Specifications

Word
00
01–16
17–18
19–255

Figure 100. Security Set Password information

Identifier
Security Level
Password
Master Password Revision Code
The setting of the Identifier and Security level bits interact as follows:
Identifier = User / Security level = High
Identifier = Master / Security level = High
Identifier = User / Security level = Maximum
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 bytes )
Master Password Revision Code
Reserved
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.
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
password is forgotten, only an Security Erase Prepare/Security Unit command
can unlock the device and all data will be lost.
The 32 bytes are always significant in the text of the password.
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 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.
This combination will set a master password but will NOT enable the security
mode feature (lock function).
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.
Travelstar 32GH/30GT/20GN hard disk drive specifications
(valid if Word 0 bit 0 = 1)
147