raidframe on a removable volume

[Steven Bellovin <smb%cs.columbia.edu@localhost>]

If I have raidframe on hardwired drives, the kernel autoconfigures them at 
boot-time.  Suppose, though, that I have a raidframe drive connected via USB.  
When I plug it in and do 'disklabel sd0', I see that sd0a and sd0e are of type 
RAID, which is correct.  I do not have easy access to the original raid?.conf 
files, though I could probably retrieve them if I needed to, but in theory that 
shouldn't be necessary -- if the kernel can autoconfigure the drives, why can't 
user-level?

                --Steve Bellovin, http://www.cs.columbia.edu/~smb