C (Notch Parameters) - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications

7.9.11 Page 0C (Notch Parameters)
7 6
BYTE 0 PS RSVD=0
BYTE 1 Page Length = 16h
BYTE 2 ND = 1 LPN = 0
BYTE 3 Reserved = 0
BYTE 4 (MSB) Maximum Number of Notches = 8
BYTE 5
BYTE 6 (MSB)
Active Notch
BYTE 7
BYTE 8 (MSB)
Starting Boundary
BYTE 11
BYTE 12 (MSB)
Ending Boundary
BYTE 15
BYTE 16 (MSB) Pages Notched =
BYTE 23
Figure 82. Page 0C
The notch page contains parameters for direct-access devices which implement a variable number of blocks
per cylinder. Each section of the logical unit with a different number of blocks per cylinder is referred as a
notch. The only field that is changeable is the Active Notch field.
ND = ONE meaning that this device is a notched drive.
LPN = ZERO meaning that the notches are based upon physical parameters of the drive (cylinder#), not
logical parameters.
Maximum Number of Notches is the number of notches the drive can support.
Active Notch indicates which notch subsequent Mode Select/Sense command parameters pertain to. A value
of 0 is used for parameter values which apply to all notches. Values from 1 to the maximum value
depending on the model specify the notch number, where notch 1 is the outer most notch.
Following mode parameters are based on the current active notch:
Page 2
Read Buffer Full Ratio
110
O E M Spec. of DDRS-3xxxx
BIT
5 4 3 2
Page Code = 0Ch
RSVD = 0
000000000000100Ch
1 0 Default
8Ch
16h
80h
00h
00h
(LSB) 08h
00h
(LSB) 00h
00h
(LSB) 00h
(LSB)
00000000h
(LSB) 0000100Ch