Seagate FreeAgent GoFlex Desk 2 TB FireWire 800 USB 2.0 External Hard Drive for Mac STBC2000100 Compatible with Time Machine software FireWire 800 or USB 2.0 plug-and-play Use the same drive interchangeably on both Mac and PC computers Upgradeable to USB 3.0 FireWire 800/ USB 2.0 desktop adapter with capacity gauge display Offers both vertical and horizontal drive orientation