IBM DTLA-305040 Hard Drive Specifications - Page 199
Write Long 32h/33h
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12.38 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 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 Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 000V0V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V V V - 0 -V Figure 144. Write Long Command (32h/33h) The Write Long command transfers the data and the ECC bytes of the designated sector from the host to the device. The data and the ECC bytes are then 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; the ECC bytes are transferred 8 bits at a time. The number of ECC bytes is 4 or 40 according to the setting of the Set Feature option. The default number after power-on is 4 bytes. Output parameters to the device Sector Count The number of continuous sectors to be transferred. The Sector Count must be set to one. Sector Number 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 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 The head number of the sector to be transferred. (L=0) In LBA mode, this register contains LBA bits 24 - 27. (L=1) R The retry bit. If set to one, then retries are disabled. Deskstar 40GV & 75GXP hard disk drive specifications 187
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