Security Level; Master Password Revision Code; Operation Example - Hitachi HTS542516K9SA00 Specifications

Device Frozen mode

Security Level

12.9.2
Following security levels are provided.
High level security
Maximum level security
Password
12.9.3
This function can have 2 types of passwords as described below.
Master Password
User Password
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.

Master Password Revision Code

12.9.4
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.

Operation example

12.9.5
12.9.5.1 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.
12.9.5.2 User Password setting
When a User Password is set, the device will automatically enter lock mode the next time the device
is powered on.
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 can NOT be locked with the Master
Password, but the Master Password can be used for unlocking the device
locked.
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. If Software Setting
Preservation is disabled, the device is locked on COMRESET as well.
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5K250 (SATA) OEM Specification