Hitachi DK23EA Specifications - Page 75

Security Unlock [F2h]

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6.3.2.9.6 Security Unlock [F2h] This command requests a transfer of a single sector of data from the host. The following table defines the content of this sector of information. Word 0 Control Word Bit 15-1Reserved Bit 0 Identifier 1-16 Password(32bytes) 17-255 Reserved Contents 0 = Compare user password 1 = Compare master password If the Identifier bit is set to master and the device is in high security level, then the password supplied shall be compared with the stored master password. If the device is in maximum security level then the unlock shall be rejected. If the Identifier bit is set to user then the device 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 counter. This counter is initially set to five and is decrement for each password mismatch when Security Unlock command is issued and the device is locked. When this counter reaches zero then Security Unlock and Security Erase Unit commands are aborted until a power-on reset or a hard reset. Security Unlock command issued when the device is unlocked have no effect on the unlock counter. Device returns Aborted command error if the device is in Frozen mode. K6602637 Rev.3 02.27.01 - 75 -

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K6602637
Rev.3
02.27.01
- 75 -
6.3.2.9.6 Security Unlock [F2h]
This command requests a transfer of a single sector of data from the host. The following table defines the
content of this sector of information.
Word
Contents
0
Control Word
Bit 15-1Reserved
Bit 0
Identifier
0 = Compare user password
1 = Compare master password
1-16
Password(32bytes)
17-255 Reserved
If the Identifier bit is set to master and the device is in high security level, then the password supplied shall
be compared with the stored master password. If the device is in maximum security level then the unlock
shall be rejected.
If the Identifier bit is set to user then the device 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
counter. This counter is initially set to five and is decrement for each password mismatch when Security
Unlock command is issued and the device is locked. When this counter reaches zero then Security Unlock
and Security Erase Unit commands are aborted until a power-on reset or a hard reset. Security Unlock
command issued when the device is unlocked have no effect on the unlock counter.
Device returns Aborted command error if the device is in Frozen mode.