>>>Is there a way, in an app, I can check to see if there is a disc in A: drive before copying files to it?
>>
>>I'd highly recommend using the Windows Script Host over any other method, if it's available. It's both simple and not prone to the possibility of Windows throwing an error like DISKSPACE("A:") is under Windows NT. The following snippet determines if the drive is ready.

oFSO = CREATEOBJECT("Scripting.FileSystemObject")
>>oDrive = oFSO.GetDrive("A:")
>>? oDrive.IsReady

Umm, Mike, did you just hiccup here?:-)