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Fibre Channel Interface Manual, Rev. D 235
12.13.9 Notch page (0Ch)
The Notch page contains parameters for direct access devices that implement a variable number of blocks per
cylinder and support this page. Each section of the drive with a different number of blocks per cylinder is
referred to as a notch.
Note. These values are not changeable.
Field definitions (listed alphabetically)
Active Notch
The notch to which this and subsequent Mode Select and Mode Sense commands refers, until the active notch is changed
by a later Mode Select command. The value of the active notch is greater than or equal to zero (0) and less than or equal to
the Maximum Number of Notches field value.
0 This and subsequent Mode Select and Mode Sense commands refer to the parameters that apply across all
notches.
Ending Boundary
The ending of the active notch or, if the active notch is zero (0), the ending of the drive. If the LPN bit is 1, then the four
bytes represent the logical block address. If the LPN bit is zero (0), the three most significant bytes represent the cylinder
number and the least significant byte represents the head number. When used with the Mode Select command this field is
ignored.
Each notch will span a set of consecutive logical blocks on the drive, the notches will not overlap, and no logical block will
be excluded from a notch.
Table 154: Notch page (0Ch)
Bit
Byte
76543210
0
PS
0001100
Reserved Page Code (0Ch)
1
Page Length (16h)
2
ND
0000000
Default LPN Reserved
300000000
Default Reserved
4,5 (MSB)
Maximum Number of Notches
Default (LSB)
6,7 (MSB)
Active Notch
Default (LSB)
8–11 (MSB)
Starting Boundary
Default (LSB)
12–15 (MSB)
Ending Boundary
Default (LSB)
16–23 (MSB)
Pages Notched
Default (LSB)
Table
number
154
154