DriveWatch - Version 1.0 DriveWatch for helps you to easily monitor the free space on all your disk drives, yet it's just one icon in your system tray. The icon displays the info alternately for each drive, the duration of showing one drive's info is configurable. Two alert limits (yellow and red) can be specified. When the free space falls below the specified limit, the icon color changes, and (optionally) a message appears.