Bruce,
Western Digital drives typically require NO jumper if the drive is a single.
However, all the models I own will boot after a very long wait if improperly
configured via jumper.  Some BIOS will not wait that long before timing
out with an error message.  How are you setting it in bios as a slave?
Auto-detect works for detecting the slave okay, right?  The drive is probably
okay.
Western Digital and several others ship with a single jumper positioned
horizontally on the pins as a means of convenient storage for the jumper,
this has no effect on configuration because the jumper block is designed
with pin pairs arranged vertically.
Tom Turak

On Thu, 22 Apr 1999, Bruce Boschek wrote:

> Howdy,
> Sorry for the weird subject :-). I have a WD Caviar 2420 on a 486 that is
> used only for simple word processing. After a boot-virus infection and
> removal with Sophos Sweep, the drive is no longer recognized by the bios
> (auto detect does not work and if I manually put in drive parameters the
> bios reports HD failure), BUT the drive works fine as a slave. Yes, I do
> move the jumper from Slave to Master...

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