Western Digital WD1004A-27X Installation Manual page 3

IDENTIFY BOARD
This document describes the installation of the two controller boards, WD1004-
27X 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 WD1004-
27X 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 1004A-
27X 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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