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Spinpoint M8-DVR OEM Product Manual REV 1.0
59
8.2.21 Recalibrate (10h)
This command is obsolete in the ATA7 specification. The supporting of this command is for backward
compatibility purpose. The use of this command is beyond the ATA standard and not recommended by the
manufacturer.
This command moves the read/write heads from anywhere on the disk to cylinder 0. Upon receipt of the
command, the drive issues a seek to cylinder zero. The drive then waits for the seek to complete before
updating status, clearing BSY, and generating an interrupt. If the drive
cannot reach cylinder 0, it posts a
Track 0 Not Found error.
8.2.22 Security Disable Password (F6h)
The SECURITY DISABLE PASSWORD command transfers 512 bytes of data from the host. In Table 6-6 it
defines the content of the security password. If the password selected by word 0 matches the password
previously saved by the device, the device shall unlock mode. This command shall not change the Master
password. The Master password shall be reactivated only when a User password is set.
Table 8-7 Security password content
Word
Content
0
Control word.
Bit 0 Identifier 0= compare User password
1= compare Master
password
Bit
(15:1)
Reserved
1-16
Password (32 bytes)
17-255
Reserved
8.2.23 Security Erase Prepare (F3h)
The SECURITY ERASE PREPARE command shall be issued immediately before the SECURITY ERASE
UNIT command to enable device erasing and unlocking. This command prevents accidental loss of data on
the device.
8.2.24 Security Erase Unit (F4h)
This command transfers 512 bytes of data from the host. Table 6-7 defines the content of this information. If
the password does not match the password previously saved by the device, the device shall reject the
command with by abortion.