What's a “drive,” or “volume?”
When you set up your library, you’ll see this option:
PhotoStructure uses the words “disk,” “drive,” and “volume” to mean any storage device available to your computer.
This includes:
The internal hard drive of your laptop or desktop An external USB hard drive or thumb drive An SD card in a built-in or external card reader A shared network directory from your NAS, possibly spanning several drives in a RAID.