Hitachi HDS728080PLAT20 Specifications - Page 123

Output registers, Input registers

Page 123 highlights

The following symbols are used in the command descriptions. Output registers 0 1 D H L R B V x - This indicates that the bit must be set to 0. This indicates that the bit must be set to 1. The device number bit. Indicates that the device number bit of the Device/Head Register should be specified. Zero selects the master device and one selects the slave device. Head number. This indicates that the head number part of the Device/Head Register is an output parameter and should be specified. LBA mode. This indicates the addressing mode. Zero specifies CHS mode and one specifies LBA addressing mode. Retry. Original meaning is already obsolete, there is no difference between 0 and 1. (Using 0 is recommended for future compatibility.) Option Bit. This indicates that the Option Bit of the Sector Count Register be specified. (This bit is used by Set Max ADDRESS command.) Valid. This indicates that the bit is part of an output parameter and should be specified. This indicates that the hex character is not used. This indicates that the bit is not used. Input registers 0 This indicates that the bit is always set to 0. 1 This indicates that the bit is always set to 1. H Head number. This indicates that the head number part of the Device/Head Register is an input parameter and will be set by the device. V Valid. This indicates that the bit is part of an input parameter and will be set by the device to 0 or 1. N Not recommended condition for start up. Indicates that the condition of the device is not recommended for start up. - This indicates that the bit is not part of an input parameter. Symbols are used in the command descriptions: The command descriptions show the contents of the Status and Error Registers after the device has completed processing the command and has interrupted the host. Deskstar 7K80 Hard Disk Drive Specification 119

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Deskstar 7K80 Hard Disk Drive Specification
119
The following symbols are used in the command descriptions.
The command descriptions show the contents of the Status and Error Registers after the device has completed pro-
cessing the command and has interrupted the host.
Output registers
0
This indicates that the bit must be set to 0.
1
This indicates that the bit must be set to 1.
D
The device number bit. Indicates that the device number bit of the Device/Head Register should be
specified. Zero selects the master device and one selects the slave device.
H
Head number. This indicates that the head number part of the Device/Head Register is an output
parameter and should be specified.
L
LBA mode. This indicates the addressing mode. Zero specifies CHS mode and one specifies LBA
addressing mode.
R
Retry. Original meaning is already obsolete, there is no difference between 0 and 1. (Using 0 is rec-
ommended for future compatibility.)
B
Option Bit. This indicates that the Option Bit of the Sector Count Register be specified. (This bit is
used by Set Max ADDRESS command.)
V
Valid. This indicates that the bit is part of an output parameter and should be specified.
x
This indicates that the hex character is not used.
-
This indicates that the bit is not used.
Input registers
0
This indicates that the bit is always set to 0.
1
This indicates that the bit is always set to 1.
H
Head number. This indicates that the head number part of the Device/Head Register is an input
parameter and will be set by the device.
V
Valid. This indicates that the bit is part of an input parameter and will be set by the device to 0 or 1.
N
Not recommended condition for start up. Indicates that the condition of the device is not recom-
mended for start up.
-
This indicates that the bit is not part of an input parameter. Symbols are used in the command descrip-
tions: