Read Long (22H/23H); Table 91: Read Long (22H/23H) - Hitachi 5K100 - Travelstar - Hard Drive Specifications

13.16 Read Long (22h/23h)

Table 91: Read Long (22h/23h)

Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
7 6 5
CRC UNC 0
0 0 0
The Read Long command reads the designated one sector of data and the ECC bytes from the disk media. It then
transfers the data and ECC bytes from the device to the host.
After 512 bytes of data have been transferred, the device will keep setting DRQ = 1 to indicate that the device is
ready to transfer the ECC bytes to 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 4 or 51 according to the setting of Set Feature option. The
default setting is 4 bytes of ECC data.
The command makes a single attempt to read the data and does not check the data using ECC. Whatever is read is
returned to the host.
Output parameters to the device
Sector Count
LBA Low
LBA High/Mid
H
R
Input parameters from the device
Sector Count
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
0 0 0 0 0 0 0 1
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
0 0 1 0 0 0 1 R
Error Register
4 3 2 1
IDN 0 ABT T0N AMN
V 0 V 0
This indicates the number of continuous sectors to be transferred. The Sector Count must
be set to one.
This indicates the sector number of the sector to be transferred. (L = 0)
In LBA mode, this register contains LBA bits 0–7. (L = 1)
This indicates 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)
This indicates the head number of the sector to be transferred. (L = 0)
In LBA mode, this register contains LBA bits 24–27. (L = 1)
This indicates the retry bit; this bit is ignored.
This indicates the number of requested sectors not transferred
Travelstar 5K100 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
0 7 6
BSY RDY DF DSC DRQ
0 0 V
134
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- - - - - H H H H
see below
Status Register
5 4 3 2
COR IDX
0 V - 0
1 0
ERR
- V