Two people have made IDE interfaces that I know of. The problem is that you would also need to write a driver for it if it doesnt exist. This wouldnt be a casual task. Even the creation of the interface requires you to scrap a modem or terminator and soldering up your own breadboard with it.
Here are some links with information:
http://hw001.gate01.com/ikehara/dc/dcwdc.html
http://www.fuzzymuzzle.com/Dreamcast/dc-ide.htm
http://www.fuzzymuzzle.com/Bitmaster...TERs_dCdeV.htm
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