From Alex Nolan:
Drive Manager continually monitors the space available for each of your drive letters. You can also open a drive in explorer by double clicking on it. The Floppy disk drive letters A and B are ignored. It automatically refreshes every 10 seconds. This saves you having to use the "My Computer" in windows and then change to the report view. The volume label is displayed for all removable drives as well as local drives. This is useful if you have lots of thumb drives or smart media, compact flash. The serial number column is useful for keeping track of which hard disk is which or for logging you customers' hard disk serial numbers.