IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 163
Security Unlock F2h
UPC - 683728124212
View all IBM IC35L040AVVN07-0 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 163 highlights
11.26 Security Unlock (F2h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 11110010 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 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0V000V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 - - 0 -V Figure 127. Security Unlock Command (F2h) 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 to transfer a single sector of data from the host including information specified in the figure 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 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, all password protected commands are rejected until a hard reset or a power off. Deskstar 120GXP hard disk drive specifications 149