Western Digital WD1004-27X, WD1004A-27X INSTALLATION GUIDE

READ THIS FIRST

INSTALLATION GUIDE

WD1004-27X

WD1004A-27X

Winchester Disk Controller Boards

FEBRUARY 1989

IDENTIFY DRIVE

The WD1004-27X and WD1004A-27X boards work with any hard disk drive that
has the ST506/412 drive interface and no more than 1024 cylinders and 16 heads.
The Seagate 238 hard disk drive unit is such a drive.

Look in your drive manual to verify that you have an ST506/412 RLL drive or
check with your dealer.

Then check the drive manual for the drive parameters, such as those listed in Table
1-1. You'll need this information to select the proper low level format.

Table 1-1. WD1004 and WD1004A Default Drive Parameters
Formatted
Capacity

32MB 4 615 26

This board does not work with RLL drives. If you have an MFM drive you
need either the WDXT–GEN2 or WD1004A–WX1 board.

Number of
Heads

Number of
Cylinders

1-2

Sectors per
Track

IDENTIFY BOARD

This document describes the installation of the two controller boards, WD1004­27X and WD1004A-27X. These controllers are similar functionally, except for a
few features. These boards are described below.

WD1004-27X Board

Figure 1-1 shows the connector locations (J1, J2, J3, J4, and J5) on the WD1004­27X board and the location of the jumpers (W17 to W22, R23, and W25 to W28).

The WD1004-27X board has a connector at J4, which allows the controller to
connect power to FileCard® drives and jumpers W17 to W22, which permit
selection of additional options. Also the WD1004-27X board can be used as a
secondary controller.

WD1004A-27X Board

Figure 1-2 shows the connector locations (J1, J2, J3, and J5) on the WD 1004A­27X board and the location of the jumpers (R23, and W25 to W28). The
WD1004A-27X board cannot be used as a secondary controller.

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