IBM DTLA-305040 Hard Drive Specifications - Page 98

User Password Lost, Attempt limit for SECURITY UNLOCK command, Erase Unit Command with Master

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10.7.4.4 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. User Password lost LEVEL ? High Maximum \/ \/ Erase Prepare Command Erase Unit Command with Master Password \/ \/ Normal operation but data lost Unlock CMD with Master Password \/ \/ \/ Normal operation Figure 80. Password Lost 10.7.4.5 Attempt limit for SECURITY UNLOCK command The SECURITY UNLOCK command has an attempt limit. The purpose of this attempt limit is to prevent someone from attempting to unlock the drive by using various passwords multiple 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 the SECURITY ERASE UNIT command and the SECURITY UNLOCK command are then 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. Deskstar 40GV & 75GXP hard disk drive specifications 86

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10.7.4.4
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.
Unlock CMD with Master Password
\/
\/
\/
Normal operation
User Password lost
LEVEL ?
High
------------------>
\/
Maximum
\/
\/
Erase Prepare Command
Erase Unit Command with Master
Password
\/
\/
Normal operation but data lost
Figure 80. Password Lost
10.7.4.5
Attempt limit for SECURITY UNLOCK command
The SECURITY UNLOCK command has an attempt limit. The purpose of this attempt limit is to prevent
someone from attempting to unlock the drive by using various passwords multiple 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 the SECURITY ERASE UNIT command and the
SECURITY UNLOCK command are then 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.
Deskstar 40GV & 75GXP hard disk drive specifications
86