Seagate Backup Plus 500GB Portable External Hard Drive USB 3.0 (Black)(STBU500100) Keep copies of your precious digital files, in case disaster strikes 500 GB storage capacity Save feature enables user-generated content to be backed up from your favorite social network Share feature allows multiple files to be uploaded to social networks at once from your computer Install the pre-loaded NTFS driver for Mac and use the drive interchangeably between PC and Mac computers without reformatting Features USB 3.0 for quick data transfer rates; upgrade to Thunderbolt technology or FireWire 800 with the available additional adapter