Power Computing PowerCenter PRO User Manual page 205

More detail about prescan options is found in Chapter 4 of the online CD-ROM Toolkit User
NOTE
Guide.
Mounting
Figure 4. Mounting options
Select the Mounting icon to allow the Macintosh to recognize CDs that are
in formats other than Apple's standard Hierarchical File System (HFS) for-
mat.
Any ISO 9660 volumes on "dual-format" Apple HFS CD-ROMs
Enable ISO 9660... to allow your Macintosh to mount ISO 9660 volumes on
multivolume CD-ROMs. For instance, if you have a clip art CD-ROM that
has popular Macintosh graphic file formats on the Macintosh HFS volume
and popular PC graphic file formats on the ISO 9660 volume, you can select
this checkbox and mount both volumes.
Chapter 2: How To Use CD-ROM ToolKit 175