Hitachi HTS542525K9SA00 Specifications page 101

10.7.4.4 User Password lost
If the User Password is forgotten and High level security is set, the system user cannot 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.
Erase Prepare Command
Erase Unit Command
with Master Password
Normal operation but data lost
Table 63: Password lost
10.7.4.5 Attempt limit for the SECURITY UNLOCK command
The SECURITY UNLOCK command has an attempt limit, the purpose of which is to prevent attempts 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.
User Password Lost
LEVEL ? High
Maximum
Deskstar 7K160 Hard Disk Drive Specification
Unlock CMD with Master Password
Normal operation
87