As part of a larger rollout of its new GoFlex drives, Seagate has announced a series of GoFlex external drives specifically aimed at Mac users, pre-formatted for HFS+ but usable with Windows machines thanks to a free HFS+ driver for Windows from the company's web site which provides full read-write access. The portable external drives range from 500GB to 1.5TB, while the 3.5-inch external scales up to 3TB.