------------
USER@host /cygdrive/c
$ cd d:/
USER@host /cygdrive/d
$
------------
Quote from howto is below:
...
Change to the dir where your phpdoc snapshot is (or where you want to
have it). Use, just like in Windows, the cd command. In Cygwin, the
dir command is also supported. Before doing this it's important that
your Cygwin environment uses full paths. A simple way to initialize
this is to first type cd c: which should then put you in the
/cygdrive/c (c: root) directory. From here use your commands as usual.
...
What if you try "cd c:" and do not provide the folder, as suggested in the howto? BTW I don't have Windows anymore, so you might get guidance from someone else using cygwin (Nuno, Philip, etc).
Goba