In Centos 5.7 mounting dmg files created under OS X 10.6 with hdiutil no longer worked:
mount -t hfsplus -o loop dmgFileFromOSX10.6.dmg /mountpoint
results in
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
Without having researched it I doubt that it is the actual Centos Version that matters here.
The dmg has been created under OS X 10.6 in the terminal via:
hdiutil create -size 1024k dmgFileFromOSX10.6.dmg -fs HFS+ -volname 'test dmg'
DMG creation in the command line is a work around for the (arbritrary?) minimum size requirements of the Disk Utility program of 5.2MB and 10.1MB.
It turns out that a dmg file created with the same command line in OS X 10.4 ( on a G4 machine ) works fine. On which side 10.5 falls we did not test.