Hitachi 7K250 Specifications - Page 162
Read Multiple C4h
UPC - 000004558972
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12.20 Read Multiple (C4h) Table 86: Read Multiple (C4h) 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 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 1 1 0 0 0 1 0 0 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 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 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V The Read Multiple 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. The command execution is identical to the Read Sectors command with one exception: an interrupt is generated for each block-as defined by the Set Multiple command-instead of for each sector. Output parameters to the device Sector Count This indicates the number of continuous sectors to be transferred. The Sector Count must be set to one. Sector Number This indicates the sector number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 0-7. (L = 1) Cylinder High/Low This indicates the cylinder number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 8-15 (Low), 16-23 (High). (L = 1) H This indicates the head number of the sector to be transferred. (L = 0) In LBA mode, this register contains LBA bits 24-27. (L = 1) Input parameters from the device Sector Count This indicates the number of requested sectors not transferred. This number is zero unless an unrecoverable error occurs. Sector Number This indicates the sector number of the transferred sector. (L = 0) In LBA mode, this register contains current LBA bits 0-7. (L = 1) Deskstar 7K250 Hard Disk Drive Specification 148