Installing -current - RZ28 bad sectors

[Charles H Dickman <chd_1%nktelco.net@localhost>]

I have been trying to get NetBSD/VAX -current installed on my VS4000/90. 
The install succeeded, but the resulting system would not boot because 
there was a read error on an RZ28.

So, do RZ28 do any kind of bad sector replacement internally? If the 
answer is yes, then the disk is dead. If not how is this handled? I 
don't see to many disk scanning utilities in NetBSD.