Obscure DOS question

[Rob O'Donnell]

At 20:56 02/04/2005, Vintage Computer Festival wrote:

>On Wed, 30 Mar 2005, Scott Stevens wrote:
>
> > Couldn't you use the DOS subst command to fake out the C: drive to some
> > higher-level folder, i.e. make your D:\scratch folder into the C: drive?
> >  Directories don't have the filesystem limits that the root directory of
> > C: does.
> >
> > This of course, would 'map over' your C: drive (is that allowed by subst
> > ?)
>
>DOS 3.3 doesn't allow this, otherwise the solution would've been simple ;)

Is this a restriction on being unable to map "c:", or being unable to map 
out the boot drive (in which case the solution is simple - boot off 
something else, e.g. "a:")

I have seen boot procedures in later versions of DOS swap around drive 
letters after boot (usually diagnostic boot discs that set up a ram disc as 
C:, and have the original drive somewhere else).  Is there a mechanism in 
3.30 to do something similar?

Rob