Features: Supports hot plug & play, High speed USB 2.0 port No physical drive required Plug-and-play; no external power supply required, USB bus-powered Support all current computer systems Speeds vary depending on types of file being transferred and computer configuration. Write Rate: 3-10 Mb/S Interface USB 2.0 Excellent USB Memory stick in excellent condition About capacity: 4GB=approximately 3.6GB-3.8GB 8GB=approximately 7.4GB-7.6GB 16GB=approximately 14.4GB-14.8GB 32GB=approximately 28.5GB-30GB 64GB=approximately 57GB-60G Vendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MB Calculated, operating system with binary arithmetic: 1 MB = 1024KB, 1 GB = 1024 MB; So there are some differences between display capacity and nominal capacity of flash memory products Warm Tips: 1. To avoid data loss or mechanical damage, do not power down your computer or unplug flash disk during transfer. 2. Please do not remove your USB flash drive when it is being used otherwise your data may loss. 3. After using USB flash drive, it is better to remove it as soon as possible. That will help to extend its storage lifetime. 4. Please do not format your USB flash drive frequently, otherwise the USB will be damaged easily.