Security Erase Unit (F4H); Figure 89 Security Erase Unit Command (F4H); Figure 90 Erase Unit Information - Hitachi HTS541616J9AT00 - Travelstar 160 GB Hard Drive Specifications

14.28 Security Erase Unit (F4h)

Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
Error Register
7 6 5 4
CRC UNC 0 IDN
0 0 0 V

Figure 89 Security Erase Unit Command (F4h)

The Security Erase Unit command initializes all user data sectors, then disables the device lock function.
Note that the Security Erase Unit command initializes from LBA 0 to Native MAX LBA. Host MAX LBA set by
Initialize Drive Parameter or Set MAX ADDRESS command is ignored. So the protected area by Set MAX
ADDRESS command is also initialized.
This command requests to transfer a single sector data from the host including information specified in the
following figure.
If the password does not match then the device rejects the command with an Aborted error.
Word Description
00 Control word
bit 0
bit 1-15
01-16 Password
17-255 Reserved

Figure 90 Erase Unit Information

Identifier 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.
The Security Erase Unit command erases all user data and disables the security mode feature (device lock function).
So after completing this command, all user data will be initialized to zero with write operation. At this time, it is not
verified with read operation whether the sector of data is initialized correctly. Also, the defective sector information
and the reassigned sector information for the device are not updated. The security erase prepare command should be
completed immediately prior to the Security Erase Unit command. If the device receives a Security Erase Unit
command without a prior Security Erase Prepare command the device aborts the security erase unit command.
This command disables the security mode feature (device lock function), however the master password is still stored
internally within the device and may be re-activated later when a new user password is set. If you execute this
command on disabling the security mode feature (device lock function), the password sent by the host is NOT
compared with the password stored in the device for both the Master Password and the User Password, and then the
device only erases all user data.
The execution time of this command is shown below.
HTS541616J9AT00
Travelstar 5K160 (PATA) Hard Disk Drive Specification
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - D - - - -
1 1 1 1 0 1 0 0
3 2 1 0
0 ABT T0N AM
N
0 V 0 0
: Identifier (1-Mater, 0-User)
: Reserved
(32 bytes)
136 / 188
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
Status Register
7 6 5 4
BSY RDY DF DSC DRQ COR IDX ERR
0 V 0 V
7 6 5 4 3 2 1 0
- - - - - - - -
...See Below...
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
...See Below...
3 2 1 0
- 0 - V
81 min