This article gives instructions on how to create PGP Virtual Disks in Mac OS X.
A PGP Virtual Disk is an area of space, on any disk connected to your computer, which is set aside and encrypted. PGP Virtual Disks are much like a bank vault, and are very useful for protecting sensitive files while the rest of your computer is unlocked for work.
A PGP Virtual Disk looks and acts like an additional hard disk, although it is actually a single file that can reside on any of your computer disks.
PGP Virtual Disks are unlocked and locked by mounting and unmounting them from your computer. PGP Desktop helps manage this operation for you.
To create a new PGP Virtual Disk
Public Key Access