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Toshiba Corporation Digital Media Network Company
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10.8.37 SECURITY UNLOCK (F2h)
COMMAND CODE
1 1 1 1 0 0 1 0
REGISTER
REGISTER SETTING
NORMAL COMPLETION
DR
DRIVE No.
no change
CY
no
change
HD
no
change
SN
no
change
SC
no
change
FT
no
change
This command requests the host to transfer a sector of data including ones described in the table below .
Security Unlock Information
Word Content
0 Control
word
Bit
15-1
Reserved
Bit 0
Identifier 0=compare user password
1=compare master password
1-16
Password (32 bytes)
17-255 Reserved
If the Identifier bit is set to master and the drive is in high security level, then the supplied password will be
compared with the stored master password. If the drive is in maximum security level, then the SECURITY
UNLOCK command will be rejected.
If the Identifier bit is set to user, the drive compares the supplied password with the stored user password.
If the drive fails in comparing passwords, then the drive returns an abort error to the host and decrements the
unlock counter. This counter is initially set to five and will be decremented for each mismatched passwords
when SECURITY UNLOCK is issued and the drive is locked. When this counter is zero, SECURITY
UNLOCK and SECURITY ERASE UNIT commands are aborted until the next power-on reset or hard reset.
SECURITY UNLOCK commands issued when the drive is unlocked have no effect on the unlock counter.
10.8.38 SECURITY ERASE PREPARE (F3h)
COMMAND CODE
1 1 1 1 0 0 1 1
REGISTER
REGISTER SETTING
NORMAL COMPLETION
DR
DRIVE No.
no change
CY
no
change
HD
no
change
SN
no
change
SC
no
change
FT
no
change
The SECURITY ERASE PREPARE command must be issued immediately before the SECURITY ERASE
UNIT command to enable the drive erase and unlock. This command can prevent accidental erasure of the
drive.
