Trying out an OPENSTEP native installation on an i386 platform, I'm reminded that the EIDE drivers in the 4.2 beta diskette (EIDE driver v4.03) have better compatibility with the built-in IDE controllers on many motherboards. If you get IDE-related kernel panics during installation, try using the EIDE drivers from the 4.2 beta drivers disk instead of that from the standard drivers disk.