GSAK (Geocaching Swiss Army Knife)
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DriveExists (function)

DriveExists(sData) : boolean

Use to determine if a particular drive exists and is ready. This function has special code so that it does not return true or throw a Windows error for "ghost" drives (empty usb card reader drives for example). 

Example, test to see if the "D:" drive exists on this computer:

If DriveExists("d:")
   msgok msg="Drive D: found"

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