Seagate GoFlex 1TB Ultra-Portable External Hard Drive for Mac in Tuxedo Black with Thunderbolt Adapter STBA1000104 GoFlex Thunderbolt Adapter included Take full advantage of your Mac computer's Time Machine software and automatically save and easily recover up-to-date copies of everything on your Mac - Thunderbolt cable is included for ease of use. Drive comes formatted for Mac computers but works on your PC computers too Makes it easy to read, write and share files interchangeably between both Mac and PC computers with the included downloadable HFS+ driver for PCs 3-year limited warranty. Thunderbolt cable is included for ease of use