IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive, Specifications

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12.25 Security Unlock (F2h)
see below Status 1 1 1 1 0 0 1 0 Command
- - - - - - - -
Device/Head
1 - 1 D - - - -
Device/Head
- - - - - - - - Cylinder High - - - - - - - - Cylinder High
- - - - - - - - Cylinder Low - - - - - - - - Cylinder Low
- - - - - - - -
Sector Number
- - - - - - - -
Sector Number
- - - - - - - - Sector Count - - - - - - - - Sector Count
see below Error - - - - - - - - Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V – 0 – – 0 V 0 0 0 V 0 0 0 V 0
ERR IDX COR DRQ DSC DF RDY BSY AMN T0N ABT 0 IDN 0 UNC CRC
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
Status Register Error Register
Figure 114. Security Unlock Command (F2h)
This command unlocks the password and causes the device to enter device unlock mode. If power on re-
set 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 infor-
mation specified in the figure 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, then the drive compares the supplied password with the stored user
password.
If the password compare fails then 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 a hard reset or a
power off.
Deskstar 40GV & 75GXP hard disk drive specifications
150