C-2 Hard Disk Drive Specifications and Jumper Settings
Table C-1 Specifications for 1.2-GB Hard Disk Drive
Features
Western Digital WDAC21200 1.2-GB Hard Disk Drive
Performance
Track-to-track seek
Average seek
Maximum seek
Average Latency
3.0 ms
14 ms
26 ms
8.3 ms
Rotation Speed
3600 rpm
Data Transfer Rate
Buffer to Disk
Buffer to Host
45.4 MB/s maximum
16.6 MB/s, Mode 4
Start/Stop Cycles
40,000 minimum
Buffer Size
64 KB
Interface
IDE
The drive uses one jumper block (JP7) to configure the master/slave and cable select
options of the hard drive. Jumper block JP6 has three user-selectable jumper settings: C/D
(master/slave select), A/C (no functionality), and CS (cable select). The remainder of the
jumpers are reserved for factory use. The user selectable jumpers and their settings are as
follows:
C/D
Master drive, pins 1 and 2 jumpered (factory default)
Slave drive, pins 1 and 2 not jumpered
A/C
No functionality, pins 3 and 4 not jumpered
CS
Cable select disabled, pins 5 and 6 not jumpered (factory default)
Cable select enabled, pins 5 and 6 jumpered.
