M2488 PRODUCT GUIDE
TAPE UNIT SCSI COMMANDS
April 1997
CG00000-011503 REV. A
4-59
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.
Page Descriptor:
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.
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
Содержание M2488
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Страница 57: ...M2488 PRODUCT GUIDE INSTALLATION INSTRUCTIONS April 1997 CG00000 011503 REV A 1 31 Figure 1 25 Replace Covers ...
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Страница 374: ...SENSE KEYS M2488 PRODUCT GUIDE A 2 CG00000 011503 REV A April 1997 ...
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