Fujitsu MHD2021AT, MHC2032AT, MHC2040AT, MHD2032AT manual Locked Mode, Security Unlock

Interface

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.

5-66 C141-E050-02EN