High Speed USB 3.0 Metal Flash Drive Memory Card 2TB Pendrive 512G 1TB Waterproof Usb Drive 64GB 128GB Pen Mini Memory Sticks 1. After the U disk is connected to the computer, it is best not to directly operate the file in the U disk, first copy it to the computer and then operate 2. After the U disk is used, please do not connect it to the computer for a long time, and you should unplug it after use. 3. After the U disk is used, please delete the hardware at the bottom right of the computer and then pull out the U disk, otherwise it will easily cause file loss. 4. Do not format the U disk casually. It is best to copy important files with "Develop the Good Habit of Data Backup". For any indirect, accidental or consequential data loss or damage, the store will not be responsible for Features/Benefits: Speed: high-speed read and write Applicable models: various brands of PC and compatible computers, Macintosh, PowerBook, iMAC or iBook. Operating system: Windows 98\\ME\\2000\\XP\\7, Linux2.4.x Package included: MICRO USB Flash Drive*1 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 58.5GB-60GB 128GB=approximately 110.5GB-120GB   Vendors are using Flash memory decimal arithmetic: 1MB = 1000KB, 1G = 1000MB Calculated, operating system with binary arithmetic: 1MB = 1024KB, 1GB = 1024MB; So there are some differences between display capacity and nominal capacity of flash memory products