Hitachi HTS541680J9AT00 Specifications - Page 141

Travelstar 5K160 (PATA) Hard Disk Drive Specification 14.31 Security Unlock (F2h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count -------- LBA Low -------- LBA Mid -------- LBA High -------- Device - - -D- - - - Command 11110010 Command Block Input Registers Register 76543210 Data -------- Error ...See Below... Sector Count -------- LBA Low -------- LBA Mid -------- LBA High -------- Device -------- Status ...See Below... Error Register 7 6 5 4 3 2 1 0 CRC UNC 0 IDN 0 ABT T0N AM N 0V0 0 0V0 0 Figure 94 Security Unlock Command (F2h) Status Register 7 6543 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0V0 - - 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 the following figure. 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 hard reset or a power off. Word Description 00 Control word bit 0 : Identifier (1-Mater, 0-User) bit 1-15 : Reserved 01-16 Password 17-255 Reserved Figure 95 Security Unlock Information (32 bytes) 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. 141/188