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Travelstar 5K160 (SATA) Hard Disk Drive Specification
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14.17 Read Long (22h/23h)
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
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 - L - - H H H H Device - - - - H H H H
Command 0 0 1 0 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 AM
N
BSY RDY DF DSC DRQ COR IDX ERR
0 0 0 V 0 V 0 0 0 V 0 V - 0 0 V
Figure 61 Read Long Command (22h/23h)
The Read Long command reads the designated one sector of data and the ECC bytes from the disk
media, 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 number of ECC bytes are 4 or 52
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
The number of continuous sectors to be transferred. The Sector Count must be set to
one.
LBA Low
The sector number of the sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 - 7. (L=1)
LBA High/Mid
The cylinder number of the sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 8 - 15 (Mid), 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 , but this bit is ignored.
Input Parameters From The Device
Sector Count
The number of requested sectors not transferred.
LBA Low
The sector number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
LBA High/Mid
The cylinder number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8 - 15 (Mid), 16 - 23 (High).
(L=1)
H
The head number of the transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 24-27. (L=1)
It should be noted that the device internally uses 52 bytes of ECC data on all data written or read
from the disk. The 4 byte mode of operation is provided via an emulation. It is recommended that for
testing the effectiveness and integrity of the devices ECC functions that the 52 byte ECC mode
should be used.