C-2 Hard Disk Drive Specifications and Jumper Settings
Table Appendix C-1 Specifications for 635-MB Hard Disk Drive
Features
Western Digital WDAC2635 635-MB Hard Disk Drive
Track Density
Bytes per Sector
512
User Sectors per Drive
1,249,920
Recording Method
1, 7 Run Length Limited (RLL)
Recording Density
Flux Density
Head Parking
Automatic
First Acceptable Revision Level
CCC Revision C2
ECC
Reed Solomon (24 bit On-the-fly)
Maximum Data Rate from Media
84 Mb/second
Performance
Track-to-track seek
Average seek
Maximum seek
4 ms
12.5 ms
24 ms
Average Latency
6.67 ms
Rotation Speed
4500 rpm
Controller Overhead (ms)
0.3 ms average
Interleave
1:1
Data Transfer Rate
Buffer to Disk (Mbits/s)
Buffer to Host (Mbytes/s)
51 maximum
PIO Mode3, DMA MODE 2
Spindle Start Time (TYP)
9 sec
Spindle Start Time (MAX)
15 sec
Spindle Stop Time (TYP)
5 sec
Spindle Stop Time (MAX)
10 sec
Start/Stop Cycles
50,000 CSS
Buffer Size
64 KB
Interface
IDE
635-MB HARD DISK DRIVE JUMPER SETTINGS
The 635-MB hard drive uses one user selectable jumper block to configure the master/slave
and cable select options of the hard drive. The jumper block has three jumper settings:
MA (master), SL (slave), and CS (cable select). See Figure Appendix C-1 for jumper
settings.
