Hybrid

1. Under the Orange Book standard for recordable CD, hybrid means a recordable disc that has one or more sessions already recorded, but the disc is not closed, leaving space open for future recording.
2. Hybrid can also refer to a compact disc containing both DOS/Windows and Macintosh software, which on a DOS/Windows platform is seen as a normal ISO 9660 disc, while on a Mac it appears as an HFS disc.

Also see: CD definitions, HFS, ISO 9660