I've adapted the mkisofs utility to create a shared ISO9660/HFS hybrid CD.
If you're are interested, then looks at:
http://www.ps.ucl.ac.uk/~jcpearso/mkhybrid.html
James Pearson
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Dept. Photogrammetry & Surveying Email: j.pearson(a)ps.ucl.ac.uk
University College London WWW: http://www.ps.ucl.ac.uk
Gower Street
London WC1E 6BT
England