Maxtor 10K III manual 216, Write and Verify Command Descriptor Block-Data Format

SCSI Description

￿￿￿￿94+6'The ￿WRITE#0&￿8'4+(;AND VERIFY￿%QOOCPFcommand￿￿￿'Jwrites￿host-supplied data to the unit and verifies it was written correctly. The data format and field descriptions are shown in Table 5-216and Table 5-217respectively.

WRITE AND VERIFY Command Descriptor Block-Data Format

			Operation Code (2Eh)
	1	Reserved		DPO	Reserved	BytChk	RelAdr
2	- 5		Logical Block Address
				Reserved
7	-			Transfer Length
				Control

$[VG$KV	￿￿WRITE AND￿VERIFY￿Command￿-Field Descriptions￿		￿	￿
		Disable Page Out. When the value of the field is 1, the drive tells the con-
		troller to bypass cache as much as possible. The buffers used for the
		WRITE data are given a low priority. This bit may be useful if the host CPU
		is performing a background copy operation and does not want to wipe out
(KGNFDPO		the drive's cache.
		&GUETKRVKQP
Table5-216		When DPO is 0, the drive tells the controller to cache this WRITE data in a
		normal manner.
		NOTE: The drive normally assigns a low priority to write caching. There-
		fore, the DPO bit in a WRITE command is essentially ignored.
		Byte Check. When 1, the drive performs a byte-by-byte comparison of the
BytChk		data written on the media with the data transferred from the initiator.
		When 0, the drive performs a medium verification with no data comparison
		of the sectors written by the command.
RelAdr		Relative Address. This feature is not supported and the field must be 0.
Logical Block		The address of the first logical block where the WRITE operation will occur.
Address
		The number of contiguous logical blocks of data to write and verify. The
TransferLength		drive returns CHECK CONDITION status with the correct sense data if the
		217specified transfer would cause the write operation to extend beyond the
Table5-
		Logical Block Address space.

5-172 Maxtor Atlas 10K III