Hitachi 7K400 Specifications - Page 247
Write Long 32h/33h
UPC - 000053412935
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12.55 Write Long (32h/33h) Table 175: Write Long (32h/33h) 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 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 0 0 1 1 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 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count 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 Write Long command transfers the data and the ECC bytes of the designated one sector from the host to the device, then the data and the ECC bytes are written to the disk media. After 512 bytes of data have been transferred, the device will keep setting DRQ = 1 to indicate that the device is ready to receive the ECC bytes from 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 either 4 or 40 according to setting of the Set Feature option. The default number after power on is 4 bytes. 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 the 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 the LBA bits 8-15 (Low) and bits 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 the LBA bits 24-27. (L = 1) R The retry bit. This bit is ignored. Input parameters from the device Sector Count This indicates the number of requested sectors not transferred. Sector Number This indicates the sector number of the sector to be transferred. (L = 0) In LBA mode this register contains the current LBA bits 0-7. (L = 1) Deskstar 7K400 Hard Disk Drive Specification 233