Features: 1) Sleek, Thin, easy-to-use, highly flexible protection for your files 2)Portable External hard drives 3) Adopts imported extraordinary space steel material 4) Delivers handy portable storage 5) Easy to take wherever you go 6) USB3.0-powered portable add-on storage, compatible with USB 2.0 7) Plug and play, easy to use with no software to install 8) Provides ample storage space for your music, movies and other files 9) Internal shock sensor and ramp loading technology protects your drive and data Support system: 98SE, ME, 2000, Vista, WIN7,WIN8 Specifications: Hard Drive Type:2.5" HDD USB Interface:USB 3.0 Disk Rotational Speed:5400rpm Disk Cache Size:8MB 3 Years Warranty Package includes: 1* USB 3.0 External Hard Drives 2* USB cable*1 About Capacity: hard disk vendors are using decimal arithmetic: 1MB = 1000KB, 1G = 1000MBcalculated but the operating system is using binary arithmetic: 1MB = 1024KB, 1GB = 1024MB. so there are some differences between display capacity and nominal capacity ofhard diskproducts. However, this is allowed to exist. Please do not doubt his authenticity. About capacity: That is : 1MB=1024KB, 1GB=1024MB 40 GB=about 37GB 60 GB=about 55GB 80GB=about 74GB 120GB=about 111GB 160GB=about 149GB 250GB=about 232GB 320GB=about 298GB 500GB=about 465GB 640GB=about 595GB 1TB=about 930GB 750gb=about698gb 2tb=1860gb