7K200 SATA OEM Specification
14.31Security Unlock (F2h)
Command Block Output Registers |
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| Command Block Input Registers |
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Register |
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| 7 |
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| 6 |
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| 4 |
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| 2 |
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| 1 |
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| Register |
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| 7 |
| 6 |
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| 5 |
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| 4 | 3 | 2 |
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Data |
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| Data |
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Feature |
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| Error |
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| ...See Below... |
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Sector Count |
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| Sector Count |
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LBA Low |
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| LBA Low |
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LBA Mid |
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| LBA Mid |
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LBA High |
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| LBA High |
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Device |
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| Device |
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Command |
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| Status |
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| ...See Below... |
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| Error Register |
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| Status Register |
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7 |
| 6 | 5 | 4 |
| 3 |
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| 0 |
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| 7 |
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CRC |
| UNC | 0 | IDN |
| 0 |
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| ABT |
| T0N |
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| AM |
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| BSY |
| RDY | DF |
| DSC | DRQ |
| COR |
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| IDX |
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| N |
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0 |
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Table 100 Security Unlock Command (F2h)
This command unlocks the password and causes the device to enter device unlock mode. If COMRESET with Software Setting Preservation disable or power on 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 information specified in the following table.
If the Identifier bit is set to master and the file is in high security mode then the password supplied will be compared with the stored master password. If the file is in maximum security mode then the security unlock will be rejected.
If the Identifier bit is set to user, then the file 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 then all password protected commands are rejected until a power off.
Word | Description |
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00 | Control word |
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| bit 0 | : Identifier |
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| bit | : Reserved |
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Password | (32 bytes) | |
Reserved |
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Table 101 Security | Unlock Information |
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Identifier | Zero indicates that device regards Password as User Password. One indicates that device | |
| regards Password as Master Password. | |
The user can detect if the attempt to unlock the device has failed due to a mismatched password as this is the only reason that an abort error will be returned by the file AFTER the password information has been sent to the device. If an abort error is returned by the device BEFORE the password data has been sent to the file then another problem exists.
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