Flash drives are small, portable devices that are used to store data. Typically, their storage capacity is measured in Gigabytes or GB. The higher the number of Gigabytes a flash drive has, the more storage capacity it yields. There are also different generations of flash drives, the newest being third generation, which has the fastest file transfer speeds. Flash drives are accessed by being plugged into a computers USB port and they work with either a Mac or a PC. Most current flash drives are either 2.0 or 3.0 versions. 3.0 flash drives transfer files and data more quickly, but the speed typically depends on the quality and maker of the usb drive.