IBM DTCA-24090 Hard Drive Specifications - Page 146

12.26 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 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 90. Set Features Command (EFh) The Set Feature command establishes 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 05H Enable Adaptive mode 44H 28 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 85H Disable Adaptive mode AAH Enable read look-ahead feature BBH 4 bytes of ECC apply on Read Long/Write Long commands 138 OEM Specifications of DTCA-2xxxx 2.5 inch H D D