[Coco] nitros9 proposal - cache sector 0?

[Aaron Wolfe]

Its often been noticed that sector 0 of an RBF filesystem gets
read/written an awful lot when doing nearly any disk I/O.  I've been
working on the dw server some this morning and am being reminded of
just how much.

Would it be practical to cache this sector somewhere?  256 bytes is
not tiny, but also not impossible to find in the typical system page.
The logic for a simple write-through cache would not be very complex.
 I guess I'm looking to the experts for reasons this can't work or
should never be done before looking at how to do it :)  Any thoughts?

-Aaron