Okay, after 8 hours of figuring out where the error was I finally got it exchanging ide-probe.c of my current kernel 2.2.14-SuSE with the one from the older 2.2.13-SuSE.
For some reason both versions differ, although the version number at the top is the same. And now the drive gets installed properly. I have no idea if SuSE patched the regular 2.2.14 that way that ide-probe.c got affected or not, but anyhow: I hope that there are more people who have the same problem and find this message helpful.
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