Hi,
There is no native support for mirroring in Win98. You do have a couple of options, though.
1. Hardware...
There are plug in PCI style controllers you can but that will allow you to do raid 1 in hardware. Here's an example...
http://www.positiveesolutions.com/Araid/dupli.html
(remove spaces from above URL)
Also if you were willing to upgrade your motherboard, many have builtin raid these days. Mine does - its an MSI K7T266 Pro Raid.
They're pretty cheap.
2. Software...
You could upgrade to Windows2000 Server which has built-in disk mirroring...
or...
http://www.techsoftpl.com/backup/
(remove spaces from the above URL)
Which isn't raid but does the same job...
I couldn't find any products for implementing software raid on Win98. I've never heard of any either.
Perhaps someone else has?
I would strongly reccoment going with the hardware option, though. Its quite cheap, easier to manage and wont slow your machine down.
Cheers,
Tim.