Deskstar 7K160 Hard Disk Drive Specification
257
12.50 Write Long (32h/33h)
Table 160: Write Long (32h/33h)
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 trans-
ferred 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)
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
- - - - - - - -
Data
- - - - - - - -
Feature
- - - - - - - -
Error
see below
Sector Count
0 0 0 0 0 0 0 1
Sector Count
- - - - - - - V
Sector Number
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 Low
V V V V V V V V
Cylinder High
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
Device/Head
- - - - H H H H
Command
0 0 1 1 0 0 1 R
Status
see below
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY RDY
DF
DSC
DRQ
COR IDX
ERR
0
0
0
V
0
V
0
0
0
V
0
V
-
0
-
V
Summary of Contents for Deskstar 7K160
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Page 297: ...Write Buffer 249 Write cache function 93 Write Continuous bit 102 Write DRQ interval time 30 ...