Ultra-fast Data Transfers: Works with USB 3.0 technology, this USB hard drive is much faster than - but still compatible with - USB 2.0 backup drive, allowing for super fast transfer speed at up to 6 Gbps Ultra Slim and Sturdy Design: Merely 0.5 inch thick. Sturdy plastic anti-scratch model delivers remarkable strength,durability and reliability Multi- Compatibility: Microsoft Windows, Mac OS, Linux, Android, Chromebook, PC, Laptop, Xbox One, PS4 and TV and so on Plug and Play: The external hard drive is ready to use without software installation needed. It has been formatted already. High-capacity storage to go, you can save and backup any files, movies, music, photos, games and more What's Included: 1x Portable external hard drive, 1 x USB 3.0 cable, 1 x User's manual The Actual Usable Storage Capacity May Be Less:
Type of file system used for the drive, partitioning arrangement and type of operating system could affect the actual storage capacity displayed by your computer.
1MB=1,000,000 bytes, 1GB=1,000,000,000 bytes.

250GB≈232GB
320GB≈298GB
500GB≈465GB
750GB≈698GB
1TB≈931GB

About Format:
Different system may need different format to use. You can check the User Manual to match your system.