Fujitsu M2488 manual 110 CG00000-011503 REV. a April

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

Table 4-104. REPORT DENSITY SUPPORT Data Block Field Description (Continued)

BYTE	BIT	VALUE	DESCRIPTION
12-15			The Capacity field is intended to be used to determine that the correct density is
			being used, particularly when a lower-density format is required for interchange.
			The meaning of the Capacity field is dependent on the setting of the Media bit in
			the CDB:
			a) When the Media bit in the CDB is 0, the capacity field indicates the approxi-
			mate capacity of the longest supported medium for this density. For density 09h
			(18-track) the approx. capacity is 240MB (F0h). For density 28h (36-track) the
			approx. capacity is 800MB (320H) (i.e. approx. capacity of the extended length
			tape, which is the longest supported medium for this density).
			b) When the Media bit in the CDB is 1, the capacity field indicates the approxi-
			mate capacity of the currently mounted medium for this density. For density 09h
			the approx. capacity is 240MB (F0h). For density 28h, the capacity is dependent
			on the tape length (standard or extended) of the currently mounted medium. For
			standard length tapes, the approx. capacity is 400MB (190h). For extended
			length tapes, the approx. capacity is 800MB (320h).
			Notes:
			a) The capacity is based on compression being disabled.
			b) The capacity is based on the media being in “good” condition and that “nor-
			mal” data and block sizes are used.
			c) The logical unit does not guarantee that this space is actually available in all
			cases.
			d) Direct comparison of this value between different vendors (possibly prod-
			ucts) is discouraged since the length of media and the method used to mea-
			sure maximum capacity may vary.
16-23			The Assigning Organization field contains eight bytes of ASCII data identifying
			the organization responsible for the information in this DENSITY SUPPORT
			data block. The data is left aligned within this field. The ASCII value for a space
			(20h) is used if padding is required.
24-31			The Density Name field contains eight bytes of ASCII data identifying the name
			that is associated with this DENSITY SUPPORT data block. The data is left
			aligned within this field.
32-51			The Description field contains 20 bytes of ASCII data describing the density.
			The data is left aligned within this field. The ASCII value for a space (20h) is
			used if padding is required.

4-110 CG00000-011503 REV. A April 1997