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19.10.11 Mode Page 0C (Notch Parameters)
Table 156:
Page 0C (Notch Parameters)
Byte
7
0
PS
1
2
ND=1
3
(MSB)
4-5
(MSB)
6-7
(MSB)
8-11
(MSB)
12-15
(MSB)
16-23
The notch page contains parameters for direct-access devices that 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 change-
able 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 parame-
ters.
• Maximum Number of Notches is the number of notches the drive can support. This value is drive model dependent.
• Active Notch indicates to which notch subsequent MODE SELECT/SENSE command parameters pertain. 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 outermost notch. Following mode parameters are based on the current
active notch:
•Mode Page 2
- Read Buffer Full Ratio
- Write Buffer Empty Ratio
•Mode Page 3
- Alternate Sector per Zone
- Alternate Track per Zone
6
5
4
0
Page Length = 16h
LPN=0
Reserved = 0
Maximum Number of Notches
Starting Boundary
Ending Boundary
Pages Notched
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
Bit
3
2
Page Code = 0Ch
Reserved = 0
Active Notch
188
1
0
Default
8Ch
16h
80h
00h
XXh
(LSB)
XXh
00h
(LSB)
00h
XXh
XXh
(LSB)
XXh
XXh
(LSB)
0000h
0000h
0000h
(LSB)
100Ch
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