Seagate FreeAgent GoFlex Pro FireWire 800 USB 2.0 Ultra-Portable 500 GB External Hard Drive for Mac STBB500100 High performance 7200RPM drive FireWire 800 or USB 2.0 plug-and-play Compatible with Time Machine software Upgradeable to USB 3.0 and powered eSATA Use the same drive interchangeably on both Mac and PC computers Durable soft-touch silver finish to help withstand fingerprints