IBM DTLA-305040 Hard Drive Specifications - Page 126

12.5 Format Unit (F7h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature 0 0 0 1 0 0 0 1 Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 L 1 D - - - - Command 1 1 1 1 0 1 1 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 Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0V0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 1 0 1 0 0 -0 Figure 90. Format Unit Command (F7h) The Format Unit command initializes all user data sectors after merging reassigned sector location into the defect information of the device and clearing the reassign information. Both new reassign information and new defect information are available immediately after command completion of this command and are used at next power-on reset or hard reset. Previous information of reassign and defect are erased from the device by executing this command. Note that the Format Unit command initializes from LBA 0 to Native MAX LBA regardless of the setting by the Initialize Device Parameter (91h) command or the Set Max Address (F9h) command, so that the protected area defined by these commands is also initialized. Security Erase Prepare (F3h) command should be completed just prior to the Format Unit command. If the device receives a Format Unit command without a prior Security Erase Prepare command the device aborts the Format Unit command. All values in Feature register are reserved and any values other than 11h should not be put into Feature register. This command does not request a data transfer. Command execution time depends on drive capacity. To determine the command time-out value refer to Word 89 of Identify Device data. Deskstar 40GV & 75GXP hard disk drive specifications 114