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active notch shall be greater than or equal to 0 and less than or equal to the maximum number of notches.
An active notch value of zero indicates that this and subsequent Mode Select and Mode Sense com-
mands refer to the parameters that apply across all notches.
[6]
The Starting Boundary field indicates the beginning of the active notch or, if the active notch is zero, the
beginning boundary of the drive. If the LPN bit is one, then the four bytes represent a logical block
address. If the LPN bit is zero, then the three most significant bytes shall represent the cylinder number
and the least significant byte shall represent the head number. When used with the Mode Select com-
mand, this field is ignored.
[7]
The Ending Boundary field indicates the ending of the active notch or, if the active notch is zero, the end-
ing of the drive. If the LPN bit is one, then the four bytes represent logical block address. If the LPN bit is
zero, then the three most significant bytes shall represent the cylinder number and the least significant
byte shall represent the head number. When used with the Mode Select command, this field is ignored.
Each notch shall span a set of consecutive logical blocks on the drive, the notches shall not overlap, and
no logical block shall be excluded from a notch.
[8]
The Pages Notched field is a bit map of the mode page codes that indicates which pages contain param-
eters that may be different for different notches. The most significant bit of this field corresponds to page
code 3Fh and the least significant bit corresponds to page code 00h. If a bit is one, then the correspond-
ing mode page contains parameters that may be different for different notches. If a bit is zero, then the cor-
responding mode page contains parameters that are constant for all notches.
[9]
See individual drive's Product Manual, Volume 1, Mode Sense Data section, for a table showing codes
that indicate which of these bits are changeable by the host using the Mode Select command.
SCSI Interface Product Manual, Rev. J
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