Drive Manager continually monitors the space available of or your drive letters and displays detail information about each drive such as volume, size, free, used, format, vendor serial number and more. It makes it easier to identify thumb drives and CD/DVD drives by displaying volume names and Vendor information. Drives can be hidden from explorer, CD/DVD drives can be openned / closed, Locked and unlocked. Subst drives can also be created. Drives with 5% space free are display in red, not mouted in grey and hidden in blue. It auto refreshes every 30 seconds but you can force a refresh at any point. No installation required to run.