Pendrive 128GB USB Flash Drive Cartoon Animals Pen Drive Usb Flash Memory Stick 32GB Cartoon Black Cat Unicorn Pen Drive 256GB Specification: 1.Support USB version 2.0 and 1.0 2.Hot Plug & Play 3.Durable solid-state storage 4.No external power is required 4.5V ~ 5.5V from USB port 5.Support Win98/ME/2000/XP/Vista/7, Mac OS 9.X/Linux2.4 without device drive 6.Support solution for Linux kernel version 2.4 or later version 7.Driveless for OS 9X or up 8.Compatible with USB 1.1/2.0 9.Operating Temp: -10 to +55Deg.C 1.Is the usb flash drive real capacity? Sure,Our usb flash drive is the real capacity,you can use the H2text to text it. H2text is most authoritative testing software in the world.If you need this software,we can free provide to you. 2.what is the write speed? our USB flash drive write speed is 5M/S -- 10M/S or you will lucky to get 11M+. if you want to save 1GB film in our USB flash drive,that you need the time is 2 mins,it save your time. 3.Why the USB flash drive real capacity is not correct capacity? Flash memory vendors are using decimal arithmetic:1MB = 1000KB,1G = 1000MB calculated, the operating system using binary arithmetic:1MB = 1024KB,1GB = 1024MB; so there are some differences between display capacity and nominal capacity of flash memory product About Real Capacity 1GB = approximately920MB-999MB 2GB = approximately1.8GB-1.9GB 4GB = approximately3.75GB-3.9GB 8GB = approximately 7.4GB-7.85GB 16GB = approximately 14.2GB-15.8GB 32GB = approximately 28.2GB-30GB 64GB = approximately 58GB-60GB