Hitachi 100GB 7200 RPM HTE721010G9SA00 Benutzerhandbuch

Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification

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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.

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 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

Erase Prepare Command
Erase Unit Command
  with Master Password

Normal operation but data lost

Unlock EMD with Master Password

Normal operation