Hitachi 7K250 Specifications - Page 184
Security Unlock F2h
UPC - 000004558972
View all Hitachi 7K250 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 184 highlights
12.34 Security Unlock (F2h) Table 103: Security Unlock command (F2h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 1 1 1 1 0 0 1 1 76 CRC UNC 00 Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 00 0 V 0 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status see below Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V This command unlocks the password and causes the device to enter device unlock mode. If a 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 the transfer of a single sector of data from the host including information specified in the table below. If the Identifier bit is set to master and the drive is in high security mode, the password supplied will be compared with the stored master password. If the drive is in maximum security mode, the security unlock will be rejected. If the Identifier bit is set to user, the drive compares the supplied password with the stored user password. If the password compare fails, the device returns an abort error to the host and decrements the unlock attempt counter. This counter is initially set to five and is decremented for each password mismatch. When this counter reaches zero, all password protected commands are rejected until there is a hard reset or a power off. Word Description 00 Control Word bit 0 : Identifier (1- Master, 0- User) bit 1-15 : Reserved 01-16 Password (32 bytes) 17-255 Reserved Identifier A zero indicates that the device regards Password as the User Password. A one indicates that the device regards Password as the Master Password. The user can detect if the attempt to unlock the device has failed due to a mismatched password since this is the only reason that an abort error will be returned by the drive AFTER the password information has been sent to the device. An abort error returned by the device BEFORE the password data has been sent to the drive indicates that another problem exists. Deskstar 7K250 Hard Disk Drive Specification 170