Figure 65. Password Lost; User Password Lost - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

11.9.5.4 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.
User Password Lost
Erase Prepare Command
Erase Unit Command
with Master Password
Normal operation but data lost

Figure 65. Password lost

11.9.5.5 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 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.
LEVEL ? High
Maximum
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Unlock EMD with Master Password
Normal operation
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