USB drives have their own read and write speeds and based on this speed you can use it for specific purposes like playing a game directly from the drive etc. SpeedOut is a simple freeware tool which tells you about the read and write speeds of your USB drive. The application is completely portable and does the testing of reading and writing into the drive before arriving at the actual speed of your USB drives.
You can even use this program to get the speed of external hard disks. The testing does not effect any existing files available in the USB drive nor any data is added to it. The interface is dead simple and all you need is to select the drive and click the start button.
The author claims that the tool allows you to know real drive speed, without slowdowns, caused by File Systems.
The tool does 4 read and write jobs before finally arriving at the real speed of your drive. The application is completely portable.