IBM DTNA-22160 Hard Drive Specifications - Page 132

12.25 Set Features (EFh) Command Block Output Registers Register 76543210 Data Feature VVVVVVVV Sector Count Note.1 Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11101111 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 BBK UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 80. Set Features Command (EFh) The Set Feature command is to establish the following parameters which affect the execution of certain features as shown in below table. ABT will be set to 1 in the Error Register if the Feature register contains any undefined values. Output Parameters To The Device Feature Destination code for this command. 02H Enable write cache (Warning.1) 03H Set transfer mode based on value in sector count register 44H 22 bytes of ECC apply on Read Long/Write Long commands 55H Disable read look-ahead feature 66H Disable reverting to power on defaults 82H Disable write cache AAH Enable read look-ahead feature BBH 4 bytes of ECC apply on Read Long/Write Long commands CCH Enable reverting to power on defaults Warning 1. Hard reset or power off must not be done in 5 seconds after write command completion when write cache is enabled. 124 OEM Specifications of DTNA-2xxxx 2.5 inch H D D