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10.5.4.4 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.
Figure 11 Password Lost
10.5.4.5 Attempt limit for SECURITY UNLOCK command
The SECURITY UNLOCK command has an attempt limit. The purpose of this attempt limit is to prevent someone
attempting to unlock the drive by using various passwords many times.
The device counts the password mismatch. If the password does not match, the device counts it up 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 SECURITY ERASE UNIT command and 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.
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Hard Disk Drive Specification