6 Mar
2007
6 Mar
'07
4:12 a.m.
Subject: Re: Copying DEC VAX set up disks rx50, help
From: "Chuck Guzis" <cclist at sydex.com>
Date: Mon, 05 Mar 2007 14:22:39 -0800
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On 4 Mar 2007 at 18:00, Allison wrote:
DEC did do 3.5" formats those wer RX25(720k) and RX26(1.44m) and they did
appear on later uVAX3100s.
Allison
Wrong. The RX50 format and RX33 formats are very
differnt...
Ah. So an easy accommodation is to declare a 360RPM 1.2MB drive as a
1.44MB 3.5". That keeps the 250Kbps data rate for low density while
the drive keeps spinning happily at 360 RPM. There's still the issue
of the missing IAM gap, but some National chips (8473 IIRC) seem to
be a bit more tolerant.
Cheers,
Chuck