Deskstar T7K250 Hard Disk Drive Specification
185
12.36 Security Unlock (F2h)
Table 114: Security Unlock command (F2h)
This command unlocks the password and causes the device to enter device unlock mode. If a power on reset or
hard reset is done without executing the Security Disable Password command after this command is completed, the
device will be in device lock mode. The password has not been changed yet.
The Security Unlock command requests the transfer of a single sector of data from the host including information
specified in the table below.
If the Identifier bit is set to master and the drive is in high security mode, the password supplied will be compared
with the stored master password. If the drive is in maximum security mode, the security unlock will be rejected.
If the Identifier bit is set to user, the drive compares the supplied password with the stored user password.
If the password compare fails, the device returns an abort error to the host and decrements the unlock attempt
counter. This counter is initially set to five and is decremented for each password mismatch. When this counter
reaches zero, all password protected commands are rejected until there is a hard reset or a power off.
Identifier
A zero indicates that the device regards Password as the User Password. A one indicates that the device regards
Password as the Master Password.
The user can detect if the attempt to unlock the device has failed due to a mismatched password since this is the
only reason that an abort error will be returned by the drive AFTER the password information has been sent to the
device. An abort error returned by the device BEFORE the password data has been sent to the drive indicates that
another problem exists.
Command Block Output Registers
Command Block Input Registers
Register
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Data
- - - - - - - -
Data
- - - - - - - -
Feature
- - - - - - - -
Error
see below
Sector Count
- - - - - - - -
Sector Count
- - - - - - - -
Sector Number
- - - - - - - -
Sector Number
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder High
- - - - - - - -
Cylinder High
- - - - - - - -
Device/Head
1 - 1 D - - - -
Device/Head
- - - - - - - -
Command
1 1 1 1 0 0 1 1
Status
see below
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY RDY
DF
DSC
DRQ
COR IDX
ERR
0
0
0
0
0
V
0
0
0
V
0
V
-
0
-
V
Word
Description
00
Control Word
bit 0 : Identifier (1- Master, 0- User)
bit 1-15 : Reserved
01-16
Password (32 bytes)
17-255 Reserved
Summary of Contents for HDT722516DLA380
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