Hitachi HTS421212H9AT00 - Travelstar 120 GB Hard Drive Specifications page 116

The "Command set" table beginning on page page 97 shows the commands that are supported by the device. The
"Command Set (Subcommand)" table above shows the sub-commands that are supported by each command or fea-
ture.
The following symbols are used in the command descriptions:
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.
Out put 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. This indicates that the device number bit of the Device 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 recommended 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.
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.
Travelstar 4K120 Hard Disk Drive Specification
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