5.3 Host Commands
Table 5.12 Relationship between combination of Identifier and Security level, and operation of the lock function
Indentifier | Level | Description |
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|
|
User | High | The specified password is saved as a new user password. The |
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| lock function is enabled after the device is turned off and then |
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| on. LOCKED MODE can be canceled using the user |
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| 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 |
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| 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. |
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| The lock function is not enabled. |
|
|
|
(35) SECURITY UNLOCK
This command cancels LOCKED MODE.
The host transfers the
∙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.
