Maxtor 10K III manual Write 10 Command Descriptor Block-Data Format, Operation Code 2Ah Reserved

SCSI Description

￿￿￿￿94+6'￿￿￿￿￿￿%QOOCPF￿￿￿#J￿The WRITE (10) command requests that the drive write initiator-supplied data to the medium. The data format and field descriptions are shown in Table 5-214and Table 5-215respectively.

WRITE (10) Command Descriptor Block-Data Format

0		Operation Code (2Ah)
1	Reserved		DPO	FUA	Reserved	RelAdr
2 - 5		Logical Block Address
			Reserved
7 - 8			Transfer Length
			Control

$[VG$KV	￿		￿WRITE￿(10) Command￿	-Field￿Descriptions￿	￿	￿
			Disable Page Out. When the value of the field is 1, the drive tells the control-
			ler 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 per-
			forming a background copy operation and does not want to wipe out the
(KGNFDPO			drive's cache.
			&GUETKRVKQP
Table5		-214When 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. Therefore,
			the DPO bit in a WRITE command is ignored.
			Force Unit Access. When 1, the data must be written on the medium before
			GOOD status is returned. When 0, GOOD status may be returned after the
FUA			data is fetched from the initiator and before it is written to the medium. If
			the WCE (Write Cache Enable) bit on the MODE SELECT command Caching
			Page is clear, the FUA bit is ignored and behaves as if it were always set (that
			is, if WCE = 0, the controller forces FUA = 1).
Logical Block			The address of the first logical block where the Write operation will occur.
Address
RelAdr			Relative Address. This drive does not support this feature; the field must be
			0.
	Table5-215
	The number of contiguous logical blocks of data to write. The drive returns
Transfer			CHECK CONDITION status with the correct sense data if the specified trans-
Length			fer would cause the write operation to extend beyond the Logical Block Ad-
			dress space.

Maxtor Atlas 10K III 5-171