Pendrive 64GB 128GB Memory Stick 128GB 2.0 Metal Usb Flash Drive 256GB 512GB Pen Drive Usb Stick 16GB 32GB 8GB 4GBFeatures: 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. Read Rate: 12Mb-18Mb/S Write Rate: 4-6 Mb/S Interface USB 2.0 Excellent USB Memory stick in excellent conditionAbout capacity: 4GB=approximately 3.6GB-3.8GB 8GB=approximately 7.2GB-7.6GB 16GB=approximately 14.4GB-14.8GB 32GB=approximately 28GB-30GB 64GB=approximately 58GB-60GB 128GB=approximately 110GB-120GB 256GB=approximately 230GB-250GB 512GB=approximately 460GB-500GBVendors are using Flash memory decimal arithmetic: 1 MB = 1000KB, 1G = 1000 MBCalculated, 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 productsPackage included:1 X USB Flash DriveAttention:l To avoid data loss or mechanical damage, do not power down your computer or unplug flash disk during transfer.l Please do not remove your USB flash drive when it is being used otherwise your datamay loss.l After using USB flash drive, it is better to remove it as soon as possible. That willhelps to extend its storage lifetime.l Please do not format your USB flash drive frequently, otherwise the USB will bedamaged easily.