13.26 Security Unlock (F2h)
see belowStatus1 1 1 1 0 0 1 0Command
- - - - - - - -Device/Head1 - 1 D - - - -Device/Head
- - - - - - - -Cylinder High- - - - - - - -Cylinder High
- - - - - - - -Cylinder Low- - - - - - - -Cylinder Low
- - - - - - - -Sector Number- - - - - - - -Sector Number
- - - - - - - -Sector Count- - - - - - - -Sector Count
see belowError- - - - - - - -Feature
- - - - - - - -Data- - - - - - - -Data
7 6 5 4 3 2 1 0Register7 6 5 4 3 2 1 0Register
Command Block Input RegistersCommand Block Output Registers
V-0--0V000V000V0
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 108. 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 to transfer a single sector of data from the host including
information specified in Figure 109 below.
If the Identifier bit is set to master and the file is in high security mode then the password supplied will be
compared with the stored master password. If the file is in maximum security mode then the security
unlock will be rejected.
If the Identifier bit is set to user, then the file 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 there is a hard reset
or a power off.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
159
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