17 Mar
2002
17 Mar
'02
8:30 a.m.
Actually one system did use it with hard sectoring, Northstar.
All of the others were WDC or 765 based.
Allison
-----Original Message-----
From: Richard Erlacher <edick(a)idcomm.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Sunday, March 17, 2002 2:28 PM
Subject: Re: DSQD Drives (Was: RE: Diags/Boot image for Altos 580)
The one I had used a standard sort of FDC, so it's
not likely it was
hard
sectored, nor is it likely it used some off-beat, e.g.
GCR, modulation
scheme.
Dick
----- Original Message -----
From: "ajp166" <ajp166(a)bellatlantic.net>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, March 17, 2002 11:51 AM
Subject: Re: DSQD Drives (Was: RE: Diags/Boot image for Altos 580)
From: Douglas Quebbeman
<dhquebbeman(a)theestopinalgroup.com>
DSQD generally means 80 track two sided drives such as
TEAC FD55F or G and double density encoding. Typically
they store around 800k.
FYI that can mean hard or softsectored as that is controller
not drive dependent.
IIRC the
Floppy on an Altos 580 is DSQD.
Am I correct that while different from standard
DSDD, they are *not* GCR drives? What other machines might carry these drives, can
I
hook one up to a standard PC controller in a box
running DOS, and then duplicate the disks?
Kaypro with Advent turborom, AmproLB, Micromint SB180
to name a few.
This is good to know, ST225s still pop up from
time to time...
St225, ST251 and related drives are fairly common.
Allison