wu232 Disk:58*25*9mm;Plastic (ABS) Available Capacities: 64MB, 128MB, 256MB, 512MB, 1GB Hi-Speed USB 2.0 Certified Compatible With USB 1.1 For Mac and PC, No Driver Req. * No External Power Required Functions as Hard Drive Write Protection Switch Automatic system detection as a removable disk. Shock Resistance: 1000G Min. Data Retention: 10 Years