SCSI Command Implementation
Chapter 6
Technical Reference Manual
Page 73
ND (Notched Drive): If set to zero, the drive is not notched and all other
parameters in this page are returned as zeros. If set to one, the drive is notched
and this page defines the starting and ending boundaries for each active notch.
This parameter is always set to one.
LPN (Logical or Physical Notch): When set to zero, indicates the notch
boundaries are physical addresses (i.e., cylinder and head). An LPN bit of one is
not supported.
The Maximum Number of Notches field indicates the maximum number of
notches supported by the drive.
The Active Notch field indicates which notch is being referred to by this and
subsequent MODE SELECT and MODE SENSE commands, until changed by a
later MODE SELECT command. Active notches are numbered beginning from
one up to the maximum number of notches.
The Starting Boundary field indicates the beginning of the active notch; the
three most significant bytes represent the cylinder number and the least
significant byte represents the head number.
The Ending Boundary field indicates the ending of the active notch; the three
most significant bytes represent the cylinder and the least significant byte
represents the head number.
The Pages Notched field is a bit map of the MODE SELECT page codes which
indicates the pages containing parameters that are changed for different
notches. The most significant bit of this field corresponds to page code 3F and
the least significant bit represents page code 0. If a bit is a one, the
corresponding MODE SELECT page contains parameters that are changed for
different notches. If a bit is a zero, the corresponding MODE SELECT page
parameters are constant for all notches.
