Hitachi P7K500 Specifications - Page 205

10.36Security Unlock (F2h) Command Block Output Registers Register 765 4 3210 Data --- - ---- Feature --- - ---- Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 111 1 0010 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AMN 0 V 0 0 0 V 0 0 Table 148 Security Unlock Command (F2h) Status Register 7 6 5 4 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 - - 0 - V This command unlocks the password and causes the device to enter device unlock mode. If power on reset or hard 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 Table 148 on the page 198. 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. HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1) 197