IBM DTCA-24090 Hard Drive Specifications - Page 142

Word 00 01 16 17 255 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) Reserved Figure 86. 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, 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. The text of the password - all 32 bytes are always significant. 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). 134 OEM Specifications of DTCA-2xxxx 2.5 inch H D D