Hard Sector Diskettes, was Re: Northstar Horizon
dkelvey at hotmail.com
Sun Nov 26 18:01:55 CST 2006
>From: Jim Battle <frustum at pacbell.net>
>Here is the link to the rest of Heiko's pages:
There is a problem with Heiko's and that is that you have to remove
the disk from the envelope. I created a jig that I use to punch holes
that I made from an old SA400 disk frame. It has the advantage that
one can punch the holes while still in the envelope.
I put some small aluminum blocks where the optical sensor and
LED used to be. I have detents on the flywheel that correspond
to the locations where the holes should be. I use the shank of
a #93 ( I think that is the right size ) bit as the punch. This
I sharpened such that it has two flukes, similar to what a paper
To punch disk, I rotate the floppy to expose the index. I slide
the drill shank through one of the holes in the punch block
and the disk index hole. I rotate the flywheel to the detent
that corresponds to the index and close the disk door.
This clamps the disk on the spindle, and aligns the index.
I then rotate the flywheel and punch each hole as indicated
by the detents on the flywheel.
It is slow but on can create about one a minute this way.
I've checked the alignement of my detents by observing
on an oscilloscope. I've used these disk on both my H89 and
my Poly 8813. They work fine. I have a N* but haven't had time
to play with it.
I do have a machine that uses 32 hard sectored 8 inch disk.
I've not had the need to create more disk for it yet. I suspect
I could make a similar punch from an old disk drive frame.
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