Sessions & Tracks : DigiBase : Workspace Browser : Audio and Video Volume Designators

Audio and Video Volume Designators
The Workspace includes columns for Audio and Video Volume designators. These two columns display, and let you designate, whether a volume is a Record, Playback, or Transfer volume.
R (Record and Playback)
Able to play audio and video files already on the volume, and record new files.
P (Playback Only)
Can play audio and video files already on the volume, but cannot have new files recorded to it.
T (Transfer)
Can only be used for storing, transferring, or auditioning files, and cannot be used for recording or playback.
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If you have a Pro Tools system with multiple drives, and you intend to record multiple tracks simultaneously, you may want to designate the System drive as a Playback only or Transfer only drive for optimal performance.
To change a volume designator:
1 Open the Workspace browser.
2 Click and select the appropriate Audio or Video designator for the volume.