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5-66 C141-E050-02EN
Table 5.12 Relationship between combination of Identifier and Security level, and
operation of the lock function
Indentifier Level
Description
User
High
The specified password is saved as a new user password. The
lock function is enabled after the device is turned off and then
on. LOCKED MODE can be canceled using the user
password or the master password already set.
Master
High
The specified password is saved as a new master password.
The lock function is not enabled.
User
Maximum
The specified password is saved as a new user password. The
lock function is enabled after the device is turned off and then
on. LOCKED MODE can be canceled using the user
password only. The master password already set cannot cancel
LOCKED MODE.
Master
Maximum
The specified password is saved as a new master password.
The lock function is not enabled.
(33) SECURITY UNLOCK
This command cancels LOCKED MODE.
The host transfers the 512-byte data shown in Table 1.1 to the device. Operation
of the device varies as follows depending on whether the host specifies the master
password.
• When the master password is selected
When the security level is LOCKED MODE is high, the password is
compared with the master password already set. If the passwords are the
same, LOCKED MODE is conceled. Otherwise, the Aborted Command error
is returned. If the security level in LOCKED MODE is set to the highest
level, the Aborted Command error is always returned.
• When the user password is selected
The password is compared with the user password already set. If the
passwords are the same, LOCKED MODE is conceled. Otherwise, the
Aborted Command error is returned.
If the password comparison fails, the device decrements the UNLOCK counter.
The UNLOCK counter initially has a value of five. When the value of the
UNLOCK counter reaches zero, this command or the SECURITY ERASE UNIT
command causes the Aborted Command error until te device is turned off and
then on, or until a hardware reset is executed. Issuing this command with
LOCKED MODE conceled (in UNLOCK MODE) has no affect on the UNLOCK
counter.