(OLD MODEL) Seagate Backup Plus 1TB Portable External Hard Drive for Mac USB 3.0 (STBW1000900) 1 TB storage capacity with lightning fast USB 3.0 transfer speed (upgrade to Thunderbolt or FireWire 800 with adapter, purchased separately) Use the Save feature to back up user-generated content from your favorite social media networks Share feature allows multiple files to be uploaded to social networks at once Install the downloadable HFS+ driver for PC and use the drive interchangeably between Mac computers and PC's without reformatting