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Table 139: Mode Select (6) parameter list
Bit
7
Byte
0
0
1
0
2
0
Block Descriptor Length Either 00h or 08h
3
0
0
1
0
2
0
3
0
4
0
Block Length (MSB)
5
Block Length
6
Block Length (LSB)
7
Mode Select Page Headers And Their Parameters (see tables 140 and 145)
0–n
Field definitions (listed alphabetically)
Table
number
Block Descriptor Length
139
The length (in bytes) of the Block Descriptor. It is equal to the number of bytes in the Block Descriptor (either 0 or 8) and
does not include the page headers and mode parameters.
0
No block descriptors are included in the parameter list. This condition is not considered an error.
Block Length
139
The length (in number of bytes) for each logical block described by the Block Descriptor. Set to desired sector size before a
Format. Valid values are even numbered sizes from 180 (B4h) to 4,096 (1000h). Not all drives can format down to 180;
some have a minimum of 256. A typical block length value is 512 (200h).
Density Code
139
Must be 00h to define the default density of the medium.
Note. For drives with capacities over 5 Gbytes, this byte is used for the Most Significant Byte (MSB) of the Number of
Blocks field.
Medium Type
139
00h
Define the default type direct access device.
208
6
5
0
0
0
0
0
0
Block descriptor
0
0
0
0
Number of Blocks (MSB)
0
0
Number of Blocks
0
0
Number of Blocks (LSB)
0
0
Parameter information
4
3
0
0
Reserved
0
0
Medium Type
0
0
Reserved
0
0
Density Code
0
0
0
0
0
0
0
0
Fibre Channel Interface Manual, Rev. D
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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