On a Mac Plus the proper drive is a SCSI Drive. I assume that is what you have? 
If you are using the older HD20 through the FDD Port you need a HD20 file in 
your system folder
On Nov 3, 2011, at 5:22 PM, [email protected] wrote:

> I have a Mac Plus, Just bought a 20 MG Apple vintage Hard drive for them.
> It has OS 6.o.8 and OS 7.1 on it. How do I get the Plus to boot up from the
> connected hard drive? I don't have a system disk for the Plus/
> 
> doug
> 
> Original Message:
> -----------------
> From: Todd Brayer [email protected]
> Date: Thu, 3 Nov 2011 16:20:39 -0400
> To: [email protected]
> Subject: Re: Anything elseŠ?
> 
> 
> 7.0.1 seems to run quite well on the old macs I've had.
> 
> Todd Brayer
> [email protected]
> 
> 
> 
> 
> On Thu, Nov 3, 2011 at 4:18 PM, Jessenator <[email protected]> wrote:
>> On Nov 1, 7:55 am, Chuck Bush wrote:
>>> It also depends on what you are trying to run. I have system 7 software
> that
>>> runs like a champ on 7.5.5 that will freeze and not run at all on 7.6.1.
>>> 
>>> I usually run my old computers on the system they were created to run on,
>>> although there have been times I have upgraded systems for one reason or
>>> another.
>> 
>> So, the MB in my ColorClassic shipped with a specific version of
>> System 7.1P - but my memories of that OS on my friend's LCII were a
>> nightmarish cascade of bomb after bomb (hence, "crashy pile of poop"
>> is so apt).
>> 
>> Is there a more stable version of 7.x before 7.6 or even 7.5? or did I
>> just get the wrong classic Mac? :) Probably no way of using system
>> 7.0.x or even 6.0.8 on this one I'm guessing…
>> 
>> I got my other 2GB external SCSI drive working, so I may do an install
>> of the original, then then 7.5.3 or 7.5.5 to see what I come up with.
>> 
>> Any particular programs or regimens I could run to accurately test the
>> stability?
>> 
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