Freecom XXS 640GB, Mobile Drive. Disk drive: 640 GB, 63.5 mm (2.5 "), Serial ATA. Weight & dimensions: 155 g, 13.5 mm, 109.8 mm, 79.5 mm. Endurance: 50000 h. Environmental conditions: 10 - 35 °C, -20 - 70 °C. System requirements: Pentium III, 900MHz/PowerPC G3/G4/G5, 256 MB