You can look at the output of my DRIVES program for the D: drive when using 
FreeDOS.  It will probably indicate that something is wrong in one or more of 
DOS's internal tables.  DRIVES is not intended to be used in batch files, but 
simply displays some information about all of the drive letters from DOS's 
perspective.  It's usually a pretty good troubleshooting tool for situations 
like this.

DRIVES is one of the programs included in my USB driver package available here:

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