Elevin(TM) 1GB 2GB 4GB 8GB 16GB 32GB USB 2.0 Swivel Metal Flash Memory Stick Storage Thumb Keychain U Disk (Black-4GB) Supports Windows 7 / 8 / 98 / Me / 2000 / XP / Vista / Linux 2.4, Mac OS 9.0 And above Etc Computer operating systems Speeds of up to for handling your large photos, videos, or other files in a fraction of the time Speed: Writing Average 10-12MB/Sec Speed:Reading Average 3-5MB/Sec Compact, slim, and light weight.Effect of U disk read and write speed will be affected by temperature and transport