Hmm, depending on head gap a high density drive is probably not very well suited (potential problems when rewriting 'harder' HD drive data bits on a 'softer' DD drive, so you should better adapt DD drives.
Have you checked the various RPMs? I dimly recall something about HD drives varying RPMs for 1.2 MB capacity (230 instead of 300 RPM?).
The
Wikipedia article has excellent references (bottom) to some further indepth info.
