IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 151
Read Sectors 20h/21h
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11.18 Read Sectors (20h/21h) Command Block Output Registers Register 76543210 Data -------- Feature -------- Sector Count V V V V V V V V 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 1 L 1 D H H H H Command 0010000R Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0V0V0V0V Command Block Input Registers Register 76543210 Data -------- Error see below Sector Count V V V V V V V V 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 - - - - H H H H Status see below Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 116. Read Sectors Command (20h/21h) The Read Sectors command reads one or more sectors of data from disk media and then transfers the data from the device to the host. The sectors are transferred through the Data Register 16 bits at a time. If an uncorrectable error occurs, the read will be terminated at the failing sector. Output parameters to the device Sector Count The number of continuous sectors to be transferred. If zero is specified, 256 sectors will be transferred. Sector Number The sector number of the first sector to be transferred. (L=0) In LBA mode this register contains LBA bits 0 - 7. (L=1) Cylinder High/Low The cylinder number of the first sector to be transferred. (L=0) In LBA mode this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1) H The head number of the first sector to be transferred. (L=0) In LBA mode this register contains LBA bits 24 - 27. (L=1) R The retry bit. This bit is ignored. Deskstar 120GXP hard disk drive specifications 137