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5K320 SATA OEM Specification
134
14.32 Security Unlock (F2h)
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 - - - - - - - -
LBA Low - - - - - - - - LBA Low - - - - - - - -
LBA Mid - - - - - - - - LBA Mid - - - - - - - -
LBA High - - - - - - - - LBA High - - - - - - - -
Device - - - - - - - - Device - - - - - - - -
Command 1 1 1 1 0 0 1 0 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 AM
N
BSY RDY DF DSC DRQ COR IDX ERR
0 V 0 0 0 V 0 0 0 V 0 - - 0 0 V
Table 101 Security Unlock Command (F2h)
This command unlocks the password and causes the device to enter device unlock mode. If
COMRESET with Software Setting Preservation disable or power on 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 the following table.
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 then all password protected commands are rejected until
a power off.
Word Description
00 Control word
bit 0
: Identifier (1-Master, 0-User)
bit 1-15
: Reserved
01-16 Password (32 bytes)
17-255 Reserved
Table 102 Security Unlock Information
Identifier
Zero indicates that device regards Password as User Password. One indicates that device
regards Password as Master Password.
The user can detect if the attempt to unlock the device has failed due to a mismatched password as this is the only
reason that an abort error will be returned by the file 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 file then another
problem exists.