The Iomega REV 35GB/90GB (native/compressed) drive is a revolutionary removable hard disk system which is more efficient and reliable than traditional tape systems, while providing portable, high-performance file storage. Compressed capacity assuming 2.6:1 data compression with high compression on Iomega Automatic Backup Pro software. This capacity may vary since compression is data and software dependent. Iomega REV drives allow you to back up and restore up to 8 times faster than tape, access files in seconds with drag-and-drop, and secure your data with password protection. The drive also includes professional-level backup software for file backup and full system backup.