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13.31 Security Unlock (F2h)
Table 106: Security Unlock (F2h)
Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
7
6
5
CRC UNC
0
0
V
0
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 to transfer a single sector of data from the host including information spec-
ified 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 5 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.
Word
00
Control Word
bit 0
bit 1-15
01-16 Password (32 bytes)
17-255 Reserved
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. If an abort error is returned by the device BEFORE the password data has been sent to the drive, then
another problem exists.
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 1 0 0 1 0
Error Register
4
3
2
1
IDN
0
ABT T0N AMN
0
0
V
0
Description
: Identifier (1- Master, 0- User)
: Reserved
Travelstar 7K100 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
0
7
6
BSY RDY DF DSC DRQ
0
0
V
152
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
Status Register
5
4
3
2
COR IDX
0
-
-
0
1
0
ERR
-
V
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