Pro - 16MB Cache
Desktop - 8MB Cache

FreeAgent™ Pro
High capacity storage that continuously copies your content to multiple locations and provides access to your files from the web. Includes USB, FireWire and eSATA.
Good For - Accessing your content from anywhere, sharing it with anyone, and syncing it to almost anything.

FreeAgent™ Desktop Drive
Easily store and automatically copy your content for safekeeping and quick acces
Good For - Gathering and accessing all of your important photos, movies, music, games and documents.