Travelstar 80GN Hard Disk Drive Specification
135
13.20 Read Sectors (20h/21h)
Table 91: Read Sectors (20h/21h)
The Read Sectors command reads one or more sectors of data from disk media and then transfers the data from the
device to the host.
The sectors are transferred through the Data Register 16 bits at a time. If an uncorrectable error occurs the read will
be terminated at the failing sector.
Output parameters to the device
Sector Count
This indicates the number of continuous sectors to be transferred. If zero is specified, then
256sectors will be transferred.
LBA Low
This is the sector number of the first sector to be transferred. (L =0)
In LBA mode this register contains the LBA bits 0–7. (L = 1)
LBA High/Low
This is the cylinder number of the first 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 is the head number of the first sector to be transferred. (L = 0)
In LBA mode this register contains the LBA bits 24–27. (L = 1)
R
This is the retry bit; this bit is ignored.
Input parameters from the device
Sector Count
This is the number of requested sectors not transferred. This will be zero, unless an unre-
coverable error occurs.
LBA Low
This is the sector number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 0–7. (L = 1)
LBA High/Low
This is the cylinder number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 8–15 (Low) and bits 16–23
(High).(L = 1)
H
This is the head number of the last transferred sector. (L = 0)
In LBA mode this register contains the current LBA bits 24–27. (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
V V V V V V V V
Sector Count
V V V V V V V V
LBA Low
V V V V V V V V
LBA Low
V V V V V V V V
LBA Mid
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
LBA High
V V V V V V V V
Device
1 L 1 D H H H H
Device
- - - - - H H H H
Command
0 0 1 0 0 0 0 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
V
0
V
0
V
0
V
0
V
0
V
-
0
-
V
Summary of Contents for IC25N020ATMR04
Page 4: ......
Page 14: ......
Page 20: ...Travelstar 80GN Hard Disk Drive Specification 10 ...
Page 21: ...Travelstar 80GN Hard Disk Drive Specification 11 Part 1 Functional specification ...
Page 22: ...Travelstar 80GN Hard Disk Drive Specification 12 ...
Page 24: ...Travelstar 80GN Hard Disk Drive Specification 14 ...
Page 34: ...Travelstar 80GN Hard Disk Drive Specification 24 ...
Page 48: ...Travelstar 80GN Hard Disk Drive Specification 38 ...
Page 67: ...Travelstar 80GN Hard Disk Drive Specification 57 Part 2 Interface specification ...
Page 68: ...Travelstar 80GN Hard Disk Drive Specification 58 ...
Page 70: ...Travelstar 80GN Hard Disk Drive Specification 60 ...
Page 72: ...Travelstar 80GN Hard Disk Drive Specification 62 September 19 2003 10 28 am ...
Page 100: ...Travelstar 80GN Hard Disk Drive Specification 90 ...
Page 106: ...Travelstar 80GN Hard Disk Drive Specification page 96 ...
Page 131: ...Travelstar 80GN Hard Disk Drive Specification 121 ...
Page 202: ...Travelstar 80GN Hard Disk Drive Specification 192 ...
Page 209: ...Travelstar 80GN Hard Disk Drive Specification 199 ...
Page 210: ...Travelstar 80GN Hard Disk Drive Specification 200 ...