Security Disable Password (F6H); Figure 100. Security Disable Password Command (F6H); Figure 101. Password Information For Security Disable Password Command - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.21 Security Disable Password (F6h)

Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7 6 5
CRC UNC 0
0 0 0

Figure 100. Security Disable Password command (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 Figure 101. 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
reactivated later by setting User Password. This command should be executed in device unlock mode.

Figure 101. Password Information for Security Disable Password command

The device will compare the password sent from this host with that specified in the control word.
Identifier
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 1 0 1 1 0
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
Word Description
00 Control word
bit 0
bits 1–15 : Reserved
01–16 Password
17–255 Reserved
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.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0 7 6 5
BSY RDY DF
0 0 V 0
: Identifier (1–Master, 0–User)
(32 bytes)
152
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4 3 2 1 0
DSC DRQ COR IDX ERR
V - 0 - V