IBM DBCA-204860 Hard Drive Specifications - Page 151
Set Max Address F9h
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12.27 Set Max Address (F9h) Command Block Output Registers Register 76543210 Data Feature Sector Count B Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head 1L1DHHHH Command 11111001 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head HHHH Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 96. Set Max Address (F9h) This command overwrites the max LBA/CYL of H D D in a range of actual device capacities. Once device receives this command, all accesses beyond that LBA/CYL are rejected with setting ABORT bit in status register. Identify device command and Identify device D M A command returns the LBA/CYL which is set via this command as a default value. Read Native Max Address command should be issued and completed immediately prior to issuing Set Max Address command. If the device receives Set Max Address command without a prior Read Native Max Address command, the device aborts the Set Max Address command. In CHS mode,Cylinder High,Cylinder Low specify the max cylinder number. The Head number of DEVICE/HEAD and Sector Number are ignored. The default value(See default CHS in Identify device information) is used for that. In LBA mode,the Head number of DEVICE/HEAD , Cylinder High, Cylinder Low and Sector Number specify the max LBA. This command will be set this LBA sa the max LBA of the device. Output Parameters To The Device B Option bit for selection whether nonvolatile or volatile. B = 0 is volatile condition. When B = 1 , MAX LBA/CYL which is set by Set Max Address command is pre- served by P O R and H A R D RESET. When B = 0 , MAX LBA/CYL which is set by Set Max Address command will be lost by P O R and H A R D RESET. B = 1 is not valid when the device is in Address Offset mode, and the command is aborted. Command Descriptions 143