>    Anders Magnusson <ragge@ludd.luth.se> wrote:
> > Actually, the RD disk shouldn't use BAD144 but another way of bad block
> > forwarding; the same as RA disks use. In that case a RD disk from a
> > MV2000 can be put directly into a MVII with RQDX3, otherwise it won't
> > work if there are bad blocks on it.
>    I'm assuming that by "RA disks" you have really meant MSCP, right? (It's
> very unfortunate that in all VAX Unices that I have seen MSCP disks are
> called ra...) But I have thought that MSCP disks use bad144, don't they?
> And who does the bad block forwarding in this case anyway? Is it the
> intelligent MSCP controller or the OS?
>    
All disks that uses MSCP are called ra?? something; because they are
programmed the same way. And MSCP disks don't use BAD144 (at least not
visible), they remap bad blocks in the MSCP hardware, not the software
drivers. On MV2000 the disk controllers are not speaking MSCP but the
disk layout are the same, so the software has to do bad block handling
on those machines.

-- Ragge