Keep Drive Spinning is an applet that makes sure that a connected drive never goes to sleep (that is, that it never spins down).
Normally this can be controlled using the Energy Saver preference pane in System Preferences, and that should be your first resort in dealing with the problem, rather than this or any other third party software. However, some external drives (e.g. Western Digital's MyBook drives) do not respect the System Preferences settings, so for them an alternative like this is needed.
This applet simply creates a launch agent that tells OS X to touch a hidden file on the selected drive once every minute so that the drive stays awake.
Launch agents are built-in OS X technology and persist across reboots, etc., so you can run this once to set-it-and-forget-it. You can find the launch agents made by Keep Drive Spinning in the LaunchAgents folder of your user's Library folder.
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