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5-128 C141-E262
(30) SECURITY UNLOCK (X 'F2')
This command cancels LOCKED MODE.
The host transfers the 512-byte data shown in Table 5.38 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 canceled. 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 canceled. 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 the device is turned off and
then on. Issuing this command with LOCKED MODE canceled (in UNLOCK
MODE) has no affect on the UNLOCK counter.
• Error reporting conditions
(1) An incorrect password is specified (ST = 51h, ER = 04h).
(2) The device is in Security Frozen mode (ST = 51h, ER = 04h).
(3) A SATA communication error occurred (ST = 51h, ER = 14h).
At command issuance (Shadow Block Registers setting contents)
CM 1 1 1 1 0 0 1 0
DH x x x x xx
CH
CL
SN
SC
FR
xx
xx
xx
xx
xx