Quadra 6400? Assuming you mean Performa 6400, unless you are running
System 7, System 8 it won't read a 400K disk, so it sounds like you
need a properly formatted 400K MFS disk. You can buy one at 
http://macbootdisk.com
or take David Colvin up on his offer for a free one, or hit up some
other members who are equipped to produce a 400K disk.

On Mar 5, 5:03 pm, netBEUI <[email protected]> wrote:
> Hi everyone,
>
> I'm new to this list so please be gentle. :) I'm a long time Mac user
> and I recently acquired a 128k Mac. The previous owner said it had
> been stored for months and worked the last time he used it but I'm not
> sure about the conditions where it was stored. When I power it on I
> get the tone and the video display is perfect but I get the flashing
> question mark disk icon. My first thought was that the disk didn't
> contain a compatible MacOS system or was unreadable but when I insert
> the disk into my Quadra 6400 it successfully mounts and shows the
> contents as system 1.
>
> I'm thinking this is a hardware issue but before I take the machine
> apart and remove the drive I wanted to get your thoughts. Is it
> possible that this is a software issue? Is there any further
> troubleshooting that I should consider?
>
> I vaguely remember on one of the early boot attempts that I received
> the flashing disk icon but it had an x in it instead of a question
> mark. I can't remember what the flashing x signifies so if anyone
> knows and if it helps to solve the problem please let me know.
>
> Thanks!

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