IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 162

Identifier 1- Master, 0- User

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Word 00 01-16 17 18-255 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 bytes) Master Password Revision Code Valid if Word 0 bit 0 = 1 Reserved Figure 126. Security Set Password Information Identifier Security Level Password Zero indicates that device regards Password as User Password. One indicates that device regards Password as Master Password. Zero indicates High level, one indicates Maximum level. If the host sets High level and the password is forgotten, the Master Password can be used to unlock the device. If the host sets Maximum level and the user password is forgotten, only a Security Erase Prepare/Security Unit command can unlock the device and all data will be lost. All 32 bytes of the text of the password 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 the Master Password Revision code. The setting of the Identifier and Security level bits interacts 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 drive 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 drive may then be unlocked by only the user password. The master password previously set is still stored in the drive 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). Deskstar 120GXP hard disk drive specifications 148

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Reserved
18-255
Master Password Revision Code
Valid if Word 0 bit 0 = 1
17
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
Description
Word
Figure 126. 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, the Master Password can be used to unlock the
device. If the host sets Maximum level and the user password is forgotten, only a
Security Erase Prepare/Security Unit command can unlock the device and all
data will be lost.
Password
All 32 bytes of the text of the password 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 the Master Password
Revision code.
The setting of the Identifier and Security level bits interacts 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 drive 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 pass-
word. The security mode feature (lock function) will be enabled from the next
power on. The drive may then be unlocked by only the user password. The
master password previously set is still stored in the drive 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).
Deskstar 120GXP hard disk drive specifications
148