Fujitsu M2488 manual Block Descriptor, Mode Select Parameter Header Field Description

M2488 PRODUCT GUIDE TAPE UNIT SCSI COMMANDS

Block Descriptor:

The block descriptor specifies the medium characteristics for all of a logical unit. The block descriptor contains a density code of 00h or 09h (default), a number of blocks, and a block length.

Table 4-56. Block Descriptor

						BITS					DEFAULT
BYTES	7	6	5		4		3	2	1	0
0					Density Code = 09h						09h
1-3				Number of Blocks = 000000h							000000h
4						Reserved					00h
5-7					Block Length						00h

Table 4-57. MODE SELECT Parameter Header Field Description

BYTE	BIT	VALUE	DESCRIPTION
0	0-7	00h, 09h	Density codes of 00h and 09h (default) create tapes in the format described
			by ANSI standard X3B5/94-043.
			Density Code 28h is described in CHAPTER 5.
1-3		000000h	The number of blocks field is always set to zero, indicating that any
			remaining logical blocks of the logical unit have the medium characteris-
			tics specified by the block descriptor.
5-7		00h	The block length specifies the length in bytes of each logical block
			described by the block descriptor. A block length of zero indicates the
			length is variable.

Page Descriptor:

Table 4-58. Page Descriptors

							BITS
BYTES	7	6		5		4		3	2	1	0
0	PS	Reserved						Page Code
1					Additional Page Length
2 - N			Page Defined or Vendor Unique Parameter Bytes

April 1997 CG00000-011503 REV. A 4-59