Iomega 33223 40GB Portable External Hard Drive USB Includes - USB 1.1/2.0 cable, supplemental power cord, Iomega Automatic Backup Pro with disaster recovery functionality (PC), Iomega Automatic Backup (Mac), Musicmatch, & Adobe Photoshop Album 2.0. Iomega Portable 40GB USB 2.0 Hard Drive - This external hard drive is designed with mobility in mind. It's ultra compact and doesn't require an external power supply. Power and data are received via a hi-speed USB 2.0 connection. And the hard metal enclosure can easily handle the wear & tear of bein 40GB Capacity 4200RPM Rotational Speed USB 2.0 interface is backwards compatible to USB 1.1 (at slower speeds) Supports Windows and Macintosh computers