100 pack USB Flash Drive with great cost performance and high quality. Plug and work, support windows 7 / 8 / 10 / Vista / XP / 2000 / ME / NT Linux and Mac OS, Compatible with USB2.0 and below Good performance in digital data storing, transferring and sharing with families, friends, workmates, clients and machines. You can store music, photos, movies, designs, manuals, programs, handouts in a quick speed the most comfortable use.makes it easy to attach to key chains, backpacks and etc. Mini design so that you can put it in pocket or any small space. Please Note: 1.Some capacity not available for data storage. 2. Approximations:storage capacity results will vary based on file size, resolution, compression, bit rate, content, host device, pre-loaded files and other factors. 3. Actual capacity of 64MB: approximately 58 - 60MB. 128MB: approximately 109-121MB. 256MB: approximately 238-240MB. 512MB: approximately 470-480MB. 1GB: approximately 960-970MB. 2GB: approximately 1.7-1.8GB. 4GB: approximately 3.6-3.75GB.