Security Mode; Security Level; Password; Master Password Revision Code - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

11.8.1 Security Mode

Following security modes are provided.
Device Locked Mode
Device Unlocked Mode
Device Frozen Mode

11.8.2 Security level

Following security levels are provided.
High level security
Maximum level security

11.8.3 Password

This function can have two types of passwords as described below.
Master Password
User Password
The system manufacturer/dealer who intends to enable the device lock function for end users must set the
master password even if only single level password protection is required. Otherwise, if the User
Password is forgotten, no one can unlock the device which is locked with the User Password.

11.8.4 Master Password Revision Code

This Master Password Revision Code is set by Security Set Password command with the master pass-
word. And this revision code field is returned in the Identify Device command word 92. The valid revision
codes are 0001h to FFFEh. The default value of Master Password Revision Code is FFFEh. Values 0000h
and FFFFh are reserved.

11.8.5 Operation example

11.8.5.1 Master Password setting
The system manufacturer/dealer can set an initial Master Password using the Security Set Password
command without enabling the Device Lock Function.
The device disables media access commands after power on. Media access
commands are enabled by either a Security Unlock command or a Security
Erase Unit command.
The device enables all commands. If a password is not set this mode is
entered after power on, otherwise it is entered by a Security Unlock or a
Security Erase Unit command.
The device enables all commands except those which can update the device
lock function, set/change password. The device enters this mode via a
Security Freeze Lock command. It cannot quit this mode until power off.
When the device lock function is enabled and the User Password is forgotten
the device can be unlocked via a Master Password.
When the device lock function is enabled and the User Password is forgotten
then only the Master Password with a Security Erase Unit command can
unlock the device. Then user data is erased.
When the Master Password is set, the device does NOT enable the Device
Lock Function, and the device CANNOT be locked with the Master Password,
but the Master Password can be used for unlocking the locked device.
The User Password should be given or changed by a system user. When the
User Password is set, the device enables the Device Lock Function, and then
the device is locked on the next power on reset or hard reset.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
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