Allright, the problem's been solved. The problem is the cable.
For some weird reason Windows cannot access 7200RPM drives connected throught an old 40-Conductor cable (though other OS's can).
Solution - Replace your IDE cable with a new one (they cost about 5$, shouldn't be any problem).
I have the exact same problem. I used to have WD20 running on promise for years fine but now I made some configuration changes and this problem just came up.
I also posted a question on experts-exchange. Maybe someone will be able to help.
Still - I'll tell you what I think might have caused...
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