Reattach/redetect allways connected umass device - is it possible ?

[M. Warner Losh]

In message: <31970.1112016818 at critter.freebsd.dk>
            "Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
: We should get an async event as soon as the media disappears.

We don't really need to know it is gone until the next time we try to
access it...

Warner