IBM DTLA-305040 Hard Drive Specifications - Page 173
Set Max Unlock Feature = 03h
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12.29.3 Set Max Unlock (Feature = 03h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature 0 0 0 0 0 0 1 1 Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 1 1 1 1 1 0 0 1 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 1 - 1 D - - - - Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 - - 0 -V Figure 123. Set Max Unlock (F9h) The device regards as Set Max Address command, if this command is immediately preceded by a Read Native Max Address command. This command requests a transfer of a single sector of data from the host including the information specified in Figure 121 on page 0 with the stored SET MAX 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 5 and is decremented for each password mismatch. When this counter reaches zero, all Set Max Unlock commands are rejected until a hard reset or a power off occurs. If the password compare matches, then the device sets the Set_Max_Unlocked state and all Set Max commands are accepted. Deskstar 40GV & 75GXP hard disk drive specifications 161
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