11.8.5.4 User Password lost
If the User Password is forgotten and High level security is set, the system user can't access any data.
However the device can be unlocked using the Master Password.
If a system user forgets the User Password and Maximum security level is set, data access is impossible.
However the device can be unlocked using the Security Erase Unit command to unlock the device and
erase all user data with the Master Password.
User Password Lost
LEVEL ? High
Maximum
Erase Prepare Command
Erase Unit Command
with Master Password
Normal operation but data lost
Unlock CMD with Master Password
Normal operation
Figure 67. Password lost
11.8.5.5 Attempt limit for the SECURITY UNLOCK command
The SECURITY UNLOCK command has an attempt limit which helps to prevent a user from attempting to
unlock the drive with various passwords numerous times.
The device counts the password mismatch. If the password does not match, the device counts it without
distinguishing the Master password and the User password. If the count reaches 5, EXPIRE bit (bit 4) of
Word 128 in Identify Device information is set, and then the SECURITY ERASE UNIT command and the
SECURITY UNLOCK command are aborted until a hard reset or a power off. The count and EXPIRE bit
are cleared after a power on reset or a hard reset.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
91
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