Hitachi 7K100 Hard Drive Specifications - Page 144
Read Long 22h/23h
UPC - 683728198671
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13.16 Read Long (22h/23h) Table 88: Read Long (22h/23h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count 0 0 0 0 0 0 0 1 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 1 R 76 CRC UNC 00 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 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 Long command reads the designated one sector of data and the ECC bytes from the disk media. It then transfers the data and ECC bytes from the device to the host. After 512 bytes of data have been transferred, the device will keep setting DRQ = 1 to indicate that the device is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time and the ECC bytes are transferred 8 bits at a time. The number of ECC bytes are 4 or 40 according to the setting of Set Feature option. The default setting is 4 bytes of ECC data. The command makes a single attempt to read the data and does not check the data using ECC. Whatever is read is returned to the host. 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. LBA Low 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) LBA High/Mid 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) R This indicates the retry bit; this bit is ignored. Input parameters from the device Sector Count This indicates the number of requested sectors not transferred Travelstar 7K100 Hard Disk Drive Specification 130