Another way is to use the Cable Select mode that is supported by all IDE
drives. I have used it for years with hard drives in removable plastics
shell. All the drives are identical and set to CS mode. The bays (or the
cable connecting the two drives) are hacked such that one bay/connector
is the master and the other is the slave. This way the same drive is
master when you plug it in one bay and slave when plugged into the
other.

The wiring is done on wire #28 (out of 40) of the hard drive cable. When
the pin of the drive is connected to ground (I think this is wire #2) it
is the master and when it is open, it is the slave (or the other way
around). For 40 pin disk, I used to do the wiring on the flat cable
itself. For the new denser ones (80 wires?) I did it in the removable
drive bay itself.

Over the years I have done this trick on tens of desktops and servers
(both Windows and Linux) and it always very handy. I used it with disk
clones software that provided an exact copy of the hard drive. This
provided immediate disaster recovery when an hard drive crashes (just
plug in the backup hard drive, no need to reinstall the OS) and allows
to try new software on a cloned hard drive 'sandbox' without having to
worry about messing your real hard drive.


Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of bob Nelson
> Sent: Sunday, June 29, 2003 8:12 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]:Dual Win PC
>
>
> I think they make a comercial version of this now, but here
> is what I dad a couple of years ago. It works for IDE drives.
>  Put in 2 IDE drives, instead of putting jumpers on for the
> master and slave put the plug with 2 wires on the jumper
> posts instead. most drives you only need 3 wires per drive.
> Connect these to a DPDT toggle switch and you can control
> wich drive is master or slave on boot. Put a different OS on
> each drive.  Up until a year ago I had  DOS/ Win 3.1 and Win
> 98 SE on my one computer.
>
> If you want more info on this contact me off list.
>
> BOB'S PROBLEM SOLVING!!  It may not be original or my Idea
> totally but it solves the problem. 45 years of experiance.
>
> Jinx wrote:
>
> >Is it possible and what are the likely consequences of having XP and
> >Win95 on the same PC ? As mentioned, I've just put XP on this PC and
> >it's working well, but the boys would like a couple of their
> games on
> >here so they can network and kick each others asses (in
> their dreams).
> >Namely Quake2 and Red Alert / Aftermath. When trying to
> install these
> >they both say that they're Win95 products (although Red
> Alert seems to
> >run OK on 98 - hmmm). So, bearing in mind how smoothly this machine
> >is running, what's likely to get buggered up by putting Win95
> >in a partition and making a dual boot PC and is it going to be
> >worth the possible headaches to follow ? I'm reluctant to try it
> >
> >TIA
> >
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