[NOTE: My apologies for raising issue of magnetic media all over again, but I can never
seem to get the search function to work on the archives, so the best I can do is depend on
Google to have some of the old threads in it's DB. (Jay, this is not a criticism,
I'm sure I'm doing something wrong, but in my two years on this list, I've
never gotten anything out of the ht://Dig searcher, even with a simple word like
'diskette'.)]
I've started to image the hundreds of RX0n diskettes I have acquired from various
sources for cataloging and preservation. I'm using my real, live PDP-11/23PLUS with a
dual-drive RX02 unit, and I've run into something I've never seen before. Recent
discussion has gone over the reliability of magentic media pretty well of late, but
frankly, I was very, very surprised to see several of these 8" floppies shedding the
oxide layer and leaving a transparent ring (okay, I flipped the diskette over hoping
spinning it the other way briefly would help) in the substrate I can see through! I was
holding the diskette to the light to get a better look and discovered the oxide completely
scrubbed off.
Track 0 was clearly (pun intended) a goner, so I tried my fingernail (lightly) and could
just flake the oxide off of the substrate. The brand is one I've never heard of,
ANSCO, and gladly there are only a handful of this brand in my pile. I've heard about
this problem, here and elsewhere, but I was not prepared to experience it myself!
Anyway, the heads in the drives are now in serious need of cleaning, and I'll probably
just dip a little isopropyl on a swap and see if I can get them clean. But I've now
found a new problem. It looks like the little presser pad on my Drive 1 is missing on the
top arm. That may explain why that particular drive is sometimes less reliable at reading
and writing.
Q: What's a good replacement material for the presser pad? Can I simply use a little
bit of dime-store felt, or is there something more exotic that I should use?
Also, since acquiring this system, and others, all with RX02 dual-drive units, I've
notices some drives read more realiably than others, that is until I write to the
diskette, then the landscape changes again, with respect to which drive will read that
diskette reliably again.
Q: Is there a source for 8" alignment diskettes? I recall one or two of the regulars
on the list mentioning having them. Is there a way to make a duplicate? Or at least to
format a diskette on a drive that's been through the alignment gig? It'd be nice
to get my hands on one or the other. I'm happy to spring for postage and
refreshment.
Thanks.
- Jared
Show replies by date