Hitachi IC25N080ATMR04-0 Specifications - Page 145
Read Sectors 20h/21h
UPC - 000000114196
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13.20 Read Sectors (20h/21h) Table 91: Read Sectors (20h/21h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count V V V V V V V V LBA Low V V V V V V V V LBA Mid V V V V V V V V LBA High V V V V V V V V Device 1 L 1 D H H H H Command 0 0 1 0 0 0 0 R 76 CRC UNC 0V Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 0V 0 V 0 V Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count V V V V V V V V LBA Low V V V V V V V V LBA Mid V V V V V V V V LBA High V V V V V V V V Device - - - - - H H H H Status see below Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V 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 LBA Low This indicates the number of continuous sectors to be transferred. If zero is specified, then 256sectors will be transferred. This is the sector number of the first sector to be transferred. (L =0) In LBA mode this register contains the LBA bits 0-7. (L = 1) LBA High/Low This is the cylinder number of the first sector to be transferred. (L = 0) In LBA mode this register contains the LBA bits 8-15 (Low) and bits 16-23(High).(L = 1) H This is the head number of the first sector to be transferred. (L = 0) In LBA mode this register contains the LBA bits 24-27. (L = 1) R This is the retry bit; this bit is ignored. Input parameters from the device Sector Count This is the number of requested sectors not transferred. This will be zero, unless an unrecoverable error occurs. LBA Low This is the sector number of the last transferred sector. (L = 0) LBA High/Low In LBA mode this register contains the current LBA bits 0-7. (L = 1) This is the cylinder number of the last transferred sector. (L = 0) In LBA mode this register contains the current LBA bits 8-15 (Low) and bits 16-23 (High).(L = 1) H This is the head number of the last transferred sector. (L = 0) In LBA mode this register contains the current LBA bits 24-27. (L = 1) Travelstar 80GN Hard Disk Drive Specification 135