Hitachi 7K250 - Deskstar - Hard Drive User Manual

Deskstar 7K250 Hard Disk Drive Specification
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12.49 Write DMA Queued Ext (36h)
Table 134: Write DMA Queued Ext Command (36h)
This command executes in a similar manner to a WRITE DMA EXT command. The device may perform a bus
release or may execute the data transfer without performing a bus release if the data is ready to transfer.
If the device performs a bus release, the host shall re-select the device using the SERVICE command.
Once the data transfer is begun, the device shall not perform a bus release until the entire data transfer has been
completed.
Output parameters to the device
Feature Current The number of continuous sectors to be transferred low order, bits (7:0)
Feature Previous The number of continuous sectors to be transferred low order, bits (15:8). A value
of 0000h in the Feature register indicates that 65,536 sectors are to be transferred.
Sector Count Current Bits 7 - 3 (Tag) contain the Tag for the command being delivered.
Sector Number Current LBA (7:0)
Sector Number Previous LBA (31:24)
Cylinder Low Current LBA (15:8)
Cylinder Low Previous LBA (39:32)
Cylinder High Current LBA (23:16)
Cylinder High Previous LBA (47:40)
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data Low - - - - - - - - Data Low - - - - - - - -
Data High - - - - - - - - Data High - - - - - - - -
Feature
Current V V V V V V V V
Error see below
Previous V V V V V V V V
Sector
Count
Current V V V V - - - -
Sector
Count
HOB=0 V V V V V V V V
Previous - - - - - - - - HOB=1 - - - - - - - -
Sector
Number
Current V V V V V V V V
Sector
Number
HOB=0 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Cylinder
Low
Current V V V V V V V V
Cylinder
Low
HOB=0 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Cylinder
High
Current V V V V V V V V Cylinder
High
HOB=0 V V V V V V V V
Previous V V V V V V V V HOB=1 V V V V V V V V
Device/Head - 1 - D - - - - Device/Head - - - - - - - -
Command 0 0 1 1 0 1 1 0 Status See below ...
Error Register Status Register
76543210 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
V00V0V00 0V0V- 0- V

Hitachi 7K250 - Deskstar - Hard Drive Specifications

General

Capacity	250 GB
Form Factor	3.5 inch
RPM	7200
Cache	8 MB
Average Seek Time	8.5 ms