Can I use ProDOS partitions on hard drives?
You can create a large number of ProDOS partitions on a SCSI hard disk but only four can be mapped at any time as Smartport devices. When you start the Macintosh, the ProDOS file system extension will mount the hard disk partitions on the Mac desktop. Files can be dragged between Mac and ProDOS volumes in the normal way to copy them. When you start the IIe card software, ProDOS partitions are unmounted from the Mac desktop until you quit using the IIe card. This prevents you from accessing files simultaneously from Mac and Apple IIe environments.