>Hi George,
>
>>Further, since -1 is returned, the drive also could not have a disk in it.
>
>Can you expand a bit more here? When I want to check whether a drive letter is valid, I do this because I intend to write on or read from that drive. Whether there's no disk in there, or it is because the drive doesn't exist, is not that important for me in this situation. In both cases I can't continue.
>
Christof,

It is functionally abiguous. Does it tell you whether or not a drive exists? Not always. This was the stated purpose of the function. Not whether or not you could write to it.