>>>Memory card reader with empty slots. See screenshot.
>>
>>OK, I guess an empty optical drive is somehow treated differently from an empty card reader "drive".
>>
>>I see you've worked around the issue using the FSO. However, I *think* WMI has a lot of detailed information about storage devices. I don't know if that includes (reliable) information about the presence of media.
>
>I'm happy with FSO - WMI promises a lot, but somehow it sounds like a too heavy piece of artillery for this mosquito of a problem.

ОК... This time I took some time to find a way, and it was in front of my nose all the time.

oFso.getDrive("j:").isReady will return .f. if there's no disk in drive J: - as simple as that. Found it on Foxite, in a thread from 2007.