360050398
10.8.37 SECURITY UNLOCK (F2h)
COMMAND CODE |
| 1 1 1 1 0 0 1 0 | REGISTER | |
| REGISTER SETTING | NORMAL COMPLETION | ||
DR |
| DRIVE No. | no change | |
CY |
|
|
| no change |
HD |
|
|
| no change |
SN |
|
|
| no change |
SC |
|
|
| no change |
FT |
|
|
| no change |
This command requests the host to transfer a sector of data including ones described in the table below .
|
| Security Unlock Information |
|
|
|
Word |
| Content |
0 | Control word | |
| Bit | Reserved |
| Bit 0 | Identifier 0=compare user password |
|
| 1=compare master password |
Password (32 bytes) | ||
Reserved |
| |
If the Identifier bit is set to master and the drive is in high security level, then the supplied password will be compared with the stored master password. If the drive is in maximum security level, then the SECURITY UNLOCK command will be rejected.
If the Identifier bit is set to user, the drive compares the supplied password with the stored user password.
If the drive fails in comparing passwords, then the drive returns an abort error to the host and decrements the unlock counter. This counter is initially set to five and will be decremented for each mismatched passwords when SECURITY UNLOCK is issued and the drive is locked. When this counter is zero, SECURITY UNLOCK and SECURITY ERASE UNIT commands are aborted until the next
10.8.38 SECURITY ERASE PREPARE (F3h)
COMMAND CODE |
| 1 1 1 1 0 0 1 1 | REGISTER | |
| REGISTER SETTING | NORMAL COMPLETION | ||
DR |
| DRIVE No. | no change | |
CY |
|
|
| no change |
HD |
|
|
| no change |
SN |
|
|
| no change |
SC |
|
|
| no change |
FT |
|
|
| no change |
The SECURITY ERASE PREPARE command must be issued immediately before the SECURITY ERASE UNIT command to enable the drive erase and unlock. This command can prevent accidental erasure of the drive.
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