Installing vsta-1.6.1 on other than 1st Dos partition?

Hello!
In the last 2 days I have downloaded & installed vsta-1.6.1, but the disk
space I have available for VSTa is not the first Dos partition. Rather, it
is the 3rd logical partition inside a Dos extended partition, and there is
of course a primary partition. Like this:
        Primary - Dos c: (dos & win3.1; full up)
        extended - (contains 3 logical parts)
                Dos d: (NT 4.0)
                Dos e: (archive)
                Dos f: (VSTa; 240Mb available)

What arguments should I pass to /vsta/boot/dos on the command line (from
Grub) to establish the root filesystem? Grub accepts these lines:
        root= (hd0,6) (filesystem is FAT)
        kernel= /vsta/boot/vsta (kernel loads...)
        module= /vsta/boot/cons
        module= /vsta/boot/namer
        module= /vsta/boot/wd d0:readp
        module= /vsta/boot/dos -d //disk/wd:wd0_dos0
                  -n fs/root (all on one line)
        module= /vsta/boot/init
        boot
The system actually establishes a filesystem (on the wrong partition?), but
then can't find inittab and 'proc 9 dies'. I think the 'wd0_dos0' is wrong
for the dos f: partition, but what should it be? I tried reading the source
files (I am not a software person, alas, but an ex-EE) and have tried some
guesses: wd0_dos3, wd0_dos6, wd0_p3, wd0_p6 ...but I'm shooting in the
dark. Time to ask those who know :)

Thankyou for taking the time to read this long-winded post and for any help
you can give.

              Scott W. Lucas, from the time-warp of Gray's Harbor,
                               Washington, USA
Received on Mon May 11 17:51:19 1998