Storage capacity: 1GB (Cannot read and write 2GB cartridges). For use with Mac"s and PC"s with an SCSI connection. Portable - Fits in your hand and weighs about 2 pounds. Free 1GB starter disk included. Operating System Requirements: Windows XP, Me, 2000, NT 4.0, 98, 95, 3.1x or Macintosh 7.x, 8.x, 9.x and OS X (natively). Interface/connection type: Ultra SCSI, (USB - limited operating system support with optional cable), (FireWire - limited operating system support with optional cable).