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User Password Lost
If the User Password is forgotten and High level security is set, the system user can’t 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 Loat
High
LEVEL ?
Unlock CMD with Master Password
Maxinum
Erase Prepare Command
Erase Unit Command
with Maseter Password
Normal operation but data lost
Normal operation
Figure 13 Password Lost
Attempt Limit for SECURITY UNLOCK Command
The SECURITY UNLOCK command has an attempt limit. The purpose of this attempt limit is to prevent that
someone attempts 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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Western Digital Ultrastar DC HC310 SATA Product Manual