Subject: Re: Formatting disks
To: None <port-vax@NetBSD.ORG>
From: Roger Ivie <IVIE@cc.usu.edu>
Date: 04/11/1996 08:10:34
> On April 10, you wrote:
> > Why can't you just format the drive on a PC system? All you'd need to know
> > presumably is the interleave.
> Nope...Different disk controller designs format their disks
> differently. In this case, *very* differently. Sector layouts, bad
> block handling, numbering...many differences.
Actaully, unless you're using an Adaptec MFM controller in your PC or an
RQDX1 in your VAX, chances are very good that the low-level disk format is
the same. The major hard-disk controller chip makers standardized on a
format, so the SMC controller used in the RQDX3 and the WD controllers
prevalent in the PC market place use the same low-level format.
Come to think of it, I'm not certain whehter the RQDX2 uses the
industry-standard format or not. I know they reworked the controller and
dropped the number of sectors per track from 18 to 17, but I don't know if
they used the industry standard format.
The VAX does require some additional high-level information that PC for I
haven't come across one yet.