Sessions & Tracks : DigiBase : Performance and Transfer Volumes

Performance and Transfer Volumes
DigiBase lets you view, manage, and import sessions and media from both Performance and Transfer volumes.
Performance Volumes
Are storage volumes (hard drives) that are suitable for playback and have been designated in the Workspace browser as Record and Playback (R) or Playback Only (P) of media files in a Pro Tools session.
Transfer Volumes
Are volumes that are not supported for media playback in Pro Tools (such as shared network volumes or CD-ROMs), or storage volumes (hard drives) that have been designated in the Workspace browser as Transfer (T) volumes. Transfer volumes cannot be used to record or play back media in a Pro Tools session. Designated Transfer (T) volumes can be useful for transferring session and media files between different Pro Tools systems.