Seagate ST3285N, Product Manual, Page: 82 / 151

Byte 3–5 The
buffer offset is added to the starting address of the
buffer to determine the source of the first data byte. The
bytes that follow are read from sequential addresses. If the
sum of the buffer offset and the transfer length exceeds the
available length reported in the Read Buffer header (see
Section 3.5.9.1), the drive transfers all the data contained
in the buffer.
Bytes 6–8 The allocation length field specifies the maximum number
of bytes read by the initiator. If the 4-byte header is trans-
ferred, the transfer length includes the header. If the transfer
length is zero, no data is read. This is not considered an
error.
3.5.9.1 Read Buffer header
Bit
Byte
7 6 5 4 3 2 1 0
0 0
1–3 Buffer capacity
Bytes 1–3 The buffer capacity field specifies the size of the drive
buffer.
72 ST3655 Family SCSI Drives Product Manual, Rev. A