Hitachi 7K100 - Travelstar - Hard Drive Specifications page 91

11.9.4.4 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
Normal operation but data lost
11.9.4.5 Attempt limit for the SECURITY UNLOCK command
The SECURITY UNLOCK command has an attempt limit, the purpose of which is to prevent someone 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 the SECURITY ERASE UNIT command and the SECURITY UNLOCK
command are then aborted until there is 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
with Master Password
Travelstar 7K100 Hard Disk Drive Specification
Unlock EMD with Master Password
Normal operation
Figure 4: Password lost
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