Hitachi HDS723020BLA642 Specifications page 244

Output Parameters To The Device
Sector Count Current
Sector Count Previous
Sector Number Current
Cylinder Low Current
Cylinder Low Previous
If the feature set associated with the log specified in the Sector Number register is not supported or enabled, or if
the values in the Sector Count, Sector Number or Cylinder Low registers are invalid, the device shall return
command aborted. If the host attempts to write to a read only log address, the device shall return command
aborted.
The number of sectors to be written to the specified log low order, bits (7:0).
The number of sectors to be written to the specified log high orders, bits (15:8). If
the number of sectors is greater than the number indicated in the Log directory,
which is available in Log number zero, the device shall return command aborted.
The log transferred to the device shall be stored by the device starting at the first
sector in the specified log.
The log to be written as described in 0 Log address definition. If the host
attempts to write to a read only log address, the device shall return command
aborted.
The first sector of the log to be written low order, bits (7:0).
The first sector of the log to be written high order, bits (15:8).
Hitachi hard disk drive specifications
244