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12.39 Security Disable Password (F6h)
The Security Disable Password command disables the security mode feature (device lock function).
The Security Disable Password command requests a transfer of a single sector of data from the host including
information specified in Section 12.33. Then the device checks the transferred password. If the User Password or
Master Password matches the given password, the device disables the security mode feature (device lock function).
This command does not change the Master Password which may be re-activated later by setting User Password.
This command should be executed in device unlock mode.
Table 192 Security Disable Password Command (F6h)
Command Input
Field
Description
FEATURE
N/A
COUNT
N/A
LBA
N/A
Bit Description
DEVICE
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 F6h
When security is disabled and the Identifier bit is set to User, then the device shall return command aborted.
Table 193 Password Information for Security Disable Password command
Word
Description
00
Control word
bits 15:1
Reserved
bit 0
: Identifier (1-Master, 0-User)
01-16
Password
(32 bytes)
17-255
Reserved
The device will compare the password sent from this host with that specified in the control word.
Identifier
Zero indicates that the device should check the supplied password against the user password
stored internally. One indicates that the device should check the given password against the
master password stored internally.
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Outputs
See Error Outputs in Section 12.4 Download Microcode (92h)
267
Hard Disk Drive Specification