5 performance characteristics – Hitachi ULTRASTAR 15K450 HUS154530VLF400 User Manual
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Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
10
Note: Values shown are nominal. Actual values will vary based on manufacturing optimization. Mode Page 03 (Format
Device Parameters), page 180 and Mode Page 0C (Notch Parameters), page 188 provide methods to determine actual
medium format and zone parameters for specific drives.
4.5 Performance characteristics
Drive performance is characterized by the following parameters:
•Command overhead
•Mechanical head positioning
- Seek time
- Latency
•Data transfer speed
•Buffering operation (read ahead/write cache)
Note: All the above parameters contribute to drive performance. There are other parameters that contribute to the perfor-
mance of the actual system. This specification tries to define the bare drive characteristics, not system throughput, which
depends on the system and the application.
Zone Sectors /Tracks Cylinder/Zone
Start
Cylinder
End
Cylinder
0
1188
5800
0
5799
1
1170
13300
5800
19099
2
1147
6400
19100
25499
3
1134
3000
25500
28499
4
1125
1200
28500
29699
5
1080
13800
29700
43499
6
1041
800
43500
44299
7
1035
1800
44300
46099
8
1026
1900
46100
47999
9
1012
2700
48000
50699
10
1002
600
50700
51299
11
990
3100
51300
54399
12
972
2200
54400
56599
13
945
4600
56600
61199
14
918
2600
61200
63799
15
900
3300
63800
67099
16
877
2500
67100
69599
17
864
200
69600
69799
User Cylinder Allocation 300 GB