Hitachi HTS541680J9AT00 Specifications - Page 71

12.8 Travelstar 5K160 (PATA) Hard Disk Drive Specification Security Mode Feature Set Security Mode Feature Set is a powerful security feature. With a device lock password, a user can prevent unauthorized access to hard disk device even if the device is removed from the computer. New commands are supported for this feature as below. Security Set Password ('F1'h) Security Unlock ('F2'h) Security Erase Prepare ('F3'h) Security Erase Unit ('F4'h) Security Freeze Lock ('F5'h) Security Disable Password ('F6'h) 12.8.1 Security mode Following security modes are provided. Device Locked mode 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. Device Unlocked mode 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. Device Frozen mode 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. 12.8.2 Security Level Following security levels are provided. High level security When the device lock function is enabled and the User Password is forgotten the device can be unlocked via a Master Password. Maximum level security 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. 12.8.3 Password This function can have 2 types of passwords as described below. Master Password When the Master Password is set, the device does NOT enable the Device Lock Function, and the device can NOT be locked with the Master Password, but the Master Password can be used for unlocking the device locked. User Password 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 next power on reset or hard reset. The system manufacturer/dealer who intends to enable the device lock function for the end users, must set the master password even if only single level password protection is required. Otherwise, if the User Password is forgotten then no one can unlock the device which is locked with the User Password. 12.8.4 Master Password Revision Code This Master Password Revision Code is set by Security Set Password command with the master password. 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. Value 0000h and FFFFh is reserved. 12.8.5 Operation example 12.8.5.1 Master Password setting The system manufacturer/dealer can set a initial Master Password using the Security Set Password command, without enabling the Device Lock Function. 71/188