IBM DTCA-24090 Hard Drive Specifications - Page 106

Option Bit.

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The following symbols are used in the command descriptions: Output Registers 0 Indicates that the bit must be set to 0. 1 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. Indicates that the head number part of the Device/Head Register is an output parameter and should be specified. L LBA mode. Indicates the addressing mode. Zero specifies CHS mode and one does LBA addressing mode. R Retry. Indicates that the Retry bit of the Command Register should be specified. B Option Bit. Indicates that the Option Bit of the Sector Count Register should be specified. (This bit is used by Set Max LBA/CYL command) V Valid. Indicates that the bit is part of an output parameter and should be specified. x Indicates that the hex character is not used. - Indicates that the bit is not used. Input Registers 0 Indicates that the bit is always set to 0. 1 Indicates that the bit is always set to 1. H Head number. Indicates that the head number part of the Device/Head Register is an input parameter and will be set by the device. V Valid. Indicates that the bit is part of an input parameter and will be set to 0 or 1 by the device. - Indicates that the bit is not part of an input parameter. 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. 98 OEM Specifications of DTCA-2xxxx 2.5 inch H D D

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The following symbols are used in the command descriptions:
Output Registers
0
Indicates that the bit must be set to 0.
1
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.
Indicates that the head number part of the Device/Head Register is an
output parameter and should be specified.
L
LBA mode.
Indicates the addressing mode. Zero specifies CHS mode and one does LBA
addressing mode.
R
Retry.
Indicates that the Retry bit of the Command Register should be specified.
B
Option Bit.
Indicates that the Option Bit of the Sector Count Register should be specified.
(This bit is used by Set Max LBA/CYL command)
V
Valid.
Indicates that the bit is part of an output parameter and should be specified.
x
Indicates that the hex character is not used.
-
Indicates that the bit is not used.
Input Registers
0
Indicates that the bit is always set to 0.
1
Indicates that the bit is always set to 1.
H
Head number.
Indicates that the head number part of the Device/Head Register is an
input parameter and will be set by the device.
V
Valid. Indicates that the bit is part of an input parameter and will be set to 0 or 1 by the
device.
-
Indicates that the bit is not part of an input parameter.
The command descriptions show the contents of the Status and Error Registers after the device has com-
pleted processing the command and has interrupted the host.
98
OEM Specifications of DTCA-2xxxx 2.5 inch HDD