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Command Specifications
272 C141-C013
(2) Mode = 0, 0, 0, 1: Header + data, with address specification
The format of the data transferred to the INIT when this mode is specified is the
same as the format of the data in the case of Mode = 0, 0, 0, 0, with the data
stored in the HDD's data buffer transferred to the INIT following the 4-byte
header. In this mode, the address in the data buffer can be specified in the "Buffer
offset" field in the CDB.
The "Transfer byte length" field in the CDB specifies the total number of bytes of
header and buffer data that can be received by the INIT. The HDD reads the data
from the data buffer beginning from the byte position in the data buffer specified
in the "Buffer offset" field of the CDB and continuing in order, then adds the 4-
byte header to it and transfers it to the INIT. Data transfer is completed at the
point when the number of bytes of the header and data from the HDD's data
buffer, specified in the "Transfer byte length" field, has been transferred, or at the
point when transfer of the header and all the data in the HDD's data buffer, to the
final byte position, has been completed. When zero is specified in the "Transfer
byte length" field, this command is terminated without executing a data transfer.
The format and contents of the 4-byte header transferred in this mode are the same
as in the case of Mode = 0, 0, 0, 0. However, the "Effective buffer data length"
field in the header indicates the size (byte length) of the data from the byte
position in the data buffer specified in the "Buffer offset" field in the CDB to the
final byte position in the data buffer, including that byte. Also, the length of the
buffer data transferred to the INIT by this command is the value for the number of
bytes in the ["Transfer byte length" field in the CDB – 4 bytes] or the value
indicated in the "Effective buffer data length" in the header, whichever is smaller.
(3) Mode = 0, 0, 1, 0: Data only, with address specification
The data transferred to the INIT when this mode is specified is only the data
which the HDD reads from the data buffer. The header is not transferred as it is
in Mode = 0,0,0,0 and Mode = 0,0,0,1. In this mode, address in the data buffer
can be specified in the "Buffer offset" field in the CDB.
The "Transfer byte length" field in the CDB specifies the total number of bytes of
buffer data that can be received by the INIT. The HDD reads the data in order
beginning from the byte position in the data buffer specified in the "Buffer
address" field and transfers it to the INIT. Data transfer is completed at the point
when the number of bytes of buffer data specified in the "Transfer byte length"
field has been completed or transfer of the buffer data to the final byte position of
the HDD's data buffer is completed. When zero is specified in the "Transfer byte
length" field, this command is terminated without executing a data transfer.