IBM IC35L020 Hard Drive Specifications - Page 155

Word 00 01-16 17-255 Description Control Word bit 0 : Identifier (1- Master, 0- User) bit 1 : Erase mode (1- Enhanced, 0- Normal) Enhanced mode is not supported bit 2-15: Reserved Password ( 32 bytes ) Reserved Figure 102. Erase Unit 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. The Security Erase Unit command erases all user data and disables the security mode feature (device lock function). So after completing this command, all user data will be initialized to zero with write operation. At this time it is not verified with read operation whether the sector of data is initialized correctly. Also, the defective sector information and the reassigned sector information for the device are not updated. The security erase prepare command should be completed immediately prior to the Security Erase Unit command. If the device receives a Security Erase Unit command without a prior Security Erase Prepare command, the device aborts the security erase unit command. This command disables the security mode feature (device lock function); however the master password is still stored internally within the device and may be reactivated later when a new user password is set. If you execute this command on disabling the security mode feature (device lock function), the password sent by the host is NOT compared with the password stored in the device for either the Master Password or the User Password. The device then erases all user data. The execution time of this command is set in word 89 of Identify device information. Deskstar 60 GXP Hard disk drive specification 141