unts":

     # CYGWIN-ROOT/etc/fstab
     D:/foo    /foo     some_fs binary 0 0
     D:/bar    /bar     some_fs binary 0 0
     E:/grill  /grill   some_fs binary 0 0

   In this way, top-level directories of each drive are available using
identical names within Cygwin.

   Note that you also need to ensure that the standard Unix directories
(like '/bin', '/lib', '/usr', '/etc') appear in the root of a drive.
This means that you must install Cygwin itself into the 'C:/' root
directory (or 'D:/', or 'E:/', etc)--instead of the recommended
installation into 'C:/cygwin/'.  In addition, all file names used in the
build system must be relative, symlinks should not be used within the
source or build directory trees, and all '-M*' options to 'gcc' except
'-MMD' must be avoided.

   This is quite a fragile setup, but it has been in historical use, and
so is documented here.