Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
179
18.10.10
Mode Page 0C (Notch Parameters)
Table 146 Page 0C (Notch Parameters)
Byte
Bit
Default
7
6
5
4
3
2
1
0
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
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 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. 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