Datasheet

Z5K500 OEM Specifications
57
12.8.5.4 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.
Figure 7 Password Lost
12.8.5.5 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 power off. The count and EXPIRE bit are cleared after
a power on reset.