18 Nov
2010
18 Nov
'10
7:37 a.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Rob Jarratt
Sent: 17 November 2010 23:57
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: Installing Ultrix 4.4 on a DECstation 5000 Model 240
blocks.
-----Original Message-----
From: Rob Jarratt [mailto:robert.jarratt at ntlworld.com]
Sent: 17 November 2010 23:42
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: Installing Ultrix 4.4 on a DECstation 5000 Model 240
It is something that crossed my mind and I have not checked. I think
this
will
have to be my next line of investigation.
Thanks
Rob
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org]
> On Behalf Of Charles Dickman
> Sent: 17 November 2010 23:15
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Installing Ultrix 4.4 on a DECstation 5000 Model 240
>
> On Wed, Nov 17, 2010 at 2:51 PM, Rob Jarratt
> <robert.jarratt at ntlworld.com>
> wrote:
> > It is failing at the stage of detecting the disks with an
> > "invalid block size" error.
> >
> > I am using a CR-506 CD-ROM drive and the disks I have are RZ56 and
RZ57.
> >
> > Could this be an issue with the CD-ROM not supporting 512byte blocks?
> > I know that microVAXen need this to install VMS, perhaps this is
> > true with Ultrix also.
> >
> > With some drives you have to set a jumper to force it to 512byte >
> -chuck
I found the sector size jumper on the CD-ROM and took it off, that was would not boot off the CD at all. So I can only
conclude that the jumper
was
right before and was already set to a 512-byte sector
size. So I think the
conclusion is that the CD-ROM drive should be OK.
Regards
Rob
This got me wondering: is the sector size purely determined by the CD-ROM
drive reading the CD? Looking at Wikipedia would suggest that on the
physical disk the sectors are always 2048 bytes, which implies that the 512
sector size is something done by the reading device.
Regards
Rob