Seagate GoFlex Ultra-Portable External Hard Drive for Mac USB 2.0 Kit (STBA1000102) GoFlex USB 2.0 adapter with 18-inch (46 cm) cable included Lets you take full advantage of your Mac computer's Time Machine software so you can automatically save and easily recover up-to-date copies of everything on your Mac 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