When trying to mount a PGP Virtual Disk created as a Dynamic disk, the PGP Virtual Disk will not mount with versions prior to PGP Desktop 9.5.
The following error will occur:
PGP Disk Mount failed because: "this PGP Disk was created by a newer version of PGP Disk."
Versions of PGP Desktop prior to PGP Desktop 9.5 did not have the functionality to create a Dynamic (resizable) disk. Therefore, The size of the disk can be dynamically expanded or compacted as data is added to or removed from the disk. A PGP Virtual Disk was created as a dynamic disk
When creating a PGP Virtual Disk, you may specify the disk to be Dynamic (resizable) or Fixed. Specifying the size is accomplished from the Capacity menu in the PGP Virtual Disks settings.
PGP Virtual Disks created as Dynamic instead of Fixed can only be mounted using PGP Desktop 9.5 and above.
If a PGP Virtual Disk must be mounted by a version prior to PGP Desktop 9.5, when creating the PGP Virtual Disk, make sure to select the Fixed size option.