Iomega 31533 Zip 250 MB USB/FireWire Drive Kit 250 MB USB drive with FireWire Adapter Ultra-thin, mobile design Compatible with USB-enabled or FireWire-enabled PC and Macintosh systems Up to 900KB/sec transfer rate with USB, 2.0 MB/second with FireWire Detachable FireWire Adapter connects to the Zip 250 USB drive via the ATAPI connector on the back of the drive. Includes AC power adapter.