L, maybe you haven't been told enough (or grumpily enough) that IMDISK is NOT a hard-disk like driver it is a SUPERFLOPPY or PARTITION one.
i guess Olof Lagerkvist is doing it but its also cool here on your app, just wondering who will come out with it FIRST
As is IMDISK connects at a "higher" level than what is needed to access the MBR.
Try reading SLOWLY here:
Unless Olof re-writes IMDISK (or ANOTHER driver) it simply won't happen.