Hitachi IC25N010ATCS04, Specifications

Page: 168 / 217

13.25 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 113. 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 infor-
mation specified in Figure 114 on page 156.
If the Identifier bit is set to master and the drive is in high security mode then the password supplied will be
compared with the stored master password. If the drive is in maximum security mode then 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 there is a hard reset
or a power off.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
155