IBM DTLA-305040 Hard Drive Specifications - Page 23

Performance characteristics, 3.2 Cylinder allocation

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4.3.2 Cylinder allocation Data Zone 0 Data Zone 1 Data Zone 2 Data Zone 3 Data Zone 4 Data Zone 5 Data Zone 6 Data Zone 7 Data Zone 8 Data Zone 9 Data Zone 10 Data Zone 11 Data Zone 12 Data Zone 13 Data Zone 14 DTLA-305XXX Physical Cylinders Sectors/Track 0-623 792 624-2047 780 2048-3727 760 3728-5343 740 5344-8095 720 8096-10975 680 10976-12879 660 12880-15263 630 15264-18591 600 18592-23023 540 23024-27551 480 27552-29743 440 29744-31343 420 31344-32511 400 32512-34326 370 DTLA-307XXX Physical Cylinders Sectors/Track 0-1375 702 1376-2831 684 2832-4239 666 4240-6975 648 6976-9759 612 9760-11551 594 11552-13631 567 13632-16239 540 16240-18319 504 18320-19567 486 19568-21199 459 21200-23519 432 23520-25215 396 25216-26319 378 26320-27724 351 Figure 3. Cylinder allocation Physical cylinder is calculated from the starting data track of 0. It is not relevant to logical CHS. Depending on the capacity some of the inner zone cylinders are not allocated. Data cylinder This cylinder contains the user data which can be sent and retrieved via read/write commands and a spare area for reassigned data. 4.4 Performance characteristics Drive performance is characterized by the following parameters: Ÿ Command overhead Ÿ Mechanical positioning - Seek time - Latency Ÿ Data transfer speed Ÿ Buffering operation (Look ahead/Write cache) All the above parameters contribute to drive performance. There are also other parameters that contribute to the performance of the actual system. This specification defines the characteristics of the drive, not the characteristics of the system throughput which depends on the system and the application. Deskstar 40GV & 75GXP hard disk drive specifications 11

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4.3.2 Cylinder allocation
351
26320–27724
370
32512–34326
Data Zone 14
378
25216–26319
400
31344–32511
Data Zone 13
396
23520–25215
420
29744–31343
Data Zone 12
432
21200–23519
440
27552–29743
Data Zone 11
459
19568–21199
480
23024–27551
Data Zone 10
486
18320–19567
540
18592–23023
Data Zone
9
504
16240–18319
600
15264–18591
Data Zone
8
540
13632–16239
630
12880–15263
Data Zone
7
567
11552–13631
660
10976–12879
Data Zone
6
594
9760–11551
680
8096–10975
Data Zone
5
612
6976–9759
720
5344–8095
Data Zone
4
648
4240–6975
740
3728–5343
Data Zone
3
666
2832–4239
760
2048–3727
Data Zone
2
684
1376–2831
780
624–2047
Data Zone
1
702
0–1375
792
0–623
Data Zone
0
Sectors/Track
Physical Cylinders
Sectors/Track
Physical Cylinders
DTLA-307XXX
DTLA-305XXX
Figure 3. Cylinder allocation
Physical cylinder is calculated from the starting data track of 0. It is not relevant to logical CHS. Depend-
ing on the capacity some of the inner zone cylinders are not allocated.
Data cylinder
This cylinder contains the user data which can be sent and retrieved via read/write commands and a
spare area for reassigned data.
4.4 Performance characteristics
Drive performance is characterized by the following parameters:
°
Command overhead
°
Mechanical positioning
-
Seek time
-
Latency
°
Data transfer speed
°
Buffering operation (Look ahead/Write cache)
All the above parameters contribute to drive performance. There are also other parameters that contri-
bute to the performance of the actual system. This specification defines the characteristics of the drive,
not the characteristics of the system throughput which depends on the system and the application.
Deskstar 40GV & 75GXP hard disk drive specifications
11