2 Mar
2006
2 Mar
'06
10:51 a.m.
Another non-obvious possibility is that the disk jacket itself has been pinched around the
edges and the extra friction is keeping the disk from spinning in the jacket. If you need
the info off the disk, cut a small margin of the jacket off around the edges or you can
remove the internal disk itself and put it in a known good jacket (cut just one end of the
jacket for the disk to slide back into the jacket). Experiment...
best regards, Steve Thatcher
-----Original Message-----
From: Tony Duell <ard at p850ug1.demon.co.uk>
Sent: Mar 2, 2006 1:31 PM
To: cctalk at classiccmp.org
Subject: Re: Fixing 8" disk hubs
All:
I'm restoring an IMSAI system which has an Icom "Frugal
Floppy"
system setup (8" FD-400 drives). I've been getting CRC errors since I got it
running a few weeks ago, so I decided to run it with the cover off to try to
see what's going on. Tonight I noticed that the floppy disk itself wasn't
spinning. The hub engages when the door closes but it must be *just* missing
contacting the diskette by *this* much.
What kind of tricks are people using to improve the contact
between the floppy disk and the spindle hub? I remember they made "hub
protectors" for 5.25" disks - is there something similar? Other ideas?
I think you're going about it in the wrong way. If the disks are not
obviously physically damaged (and you don't mention that they are), the
drive should grip them. If it doesn't, the fault is with the drive, not
with the disks. And I never believe in 'curing the symptoms'
For some reason your drive is not clamping the disk properly. Maybe
there's a spring that's not providing enough tension. Maybe a mechanical
latch is not alighned properly and the clamp is not held down far enough.
I would start looking at something like that.
-tony