IBM Deskstar 120 GXP, Specifications

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11.18 Read Sectors (20h/21h)
see below Status 0 0 1 0 0 0 0 R Command
- - - - H H H H Device/Head 1 L 1 D H H H H Device/Head
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 Cylinder Low V V V V V V V V Cylinder Low
V V V V V V V V Sector Number V V V V V V V V Sector Number
V V V V V V V V
Sector Count
V V V V V V V V
Sector Count
see below Error - - - - - - - - Feature
- - - - - - - - Data - - - - - - - - Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V – 0 – V 0 V 0 V 0 V 0 V 0 V 0
ERR IDX COR DRQ DSC DF RDY BSY AMN T0N ABT 0 IDN 0 UNC CRC
0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
Status Register Error Register
Figure 116. Read Sectors Command (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 The number of continuous sectors to be transferred. If zero is specified,
256 sectors will be transferred.
Sector Number The sector number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 0 - 7. (L=1)
Cylinder High/Low The cylinder number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1)
H The head number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 24 - 27. (L=1)
R The retry bit. This bit is ignored.
Deskstar 120GXP hard disk drive specifications
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