Sumawah HDD-100603 Fully compatible with Windows, Mac OS and Linux systems. No software or drivers required. 3GB storage capacity. Ultra-portable and lightweight. Keychain size, (2/3 Size of a Credit Card), can be clipped onto keychain or cell phone strap, Patent Pending pop-up/retractable USB head that can be stored inside the housing Advanced cooling & shock absorption using Crash Guard Technology for anti skipping and impact