Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.10.11 Mode Page 0C (Notch Parameters)
Table 156: Page 0C (Notch Parameters)
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
Byte
Bit
76543210Default
0 PS 0 Page Code = 0Ch 8Ch
1 Page Length = 16h 16h
2 ND=1 LPN=0 Reserved = 0 80h
3 Reserved = 0 00h
4-5
(MSB) Maximum Number of Notches
(LSB)
XXh
XXh
6-7
(MSB) Active Notch
(LSB)
00h
00h
8-11
(MSB)
Starting Boundary
(LSB)
XXh
XXh
12-15
(MSB)
Ending Boundary
(LSB)
XXh
XXh
16-23
(MSB)
Pages Notched
(LSB)
0000h
0000h
0000h
100Ch
