Hitachi HTS548040M9AT00 Specifications page 112

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.
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