23 Aug
2014
23 Aug
'14
6:47 p.m.
I was working on 1/2" tape recovery this week, and wanted to see if the M4
that I got from Guy worked any better that the Qualstar I was using, so I
dug the 9914 back out after a rather frustrating experience earlier this year trying
to get the tach roller resurfaced (it's the only rubber part in the whole tape
path).
It turns out 1/2" ID surgical tubing works just fine stretched over the tach roller.
It's a bit of a challenge getting it over the lip of the roller but once it's
in place it fills in the gap where the original rubber was just fine.
I was able to recover the one bad block on the 1990 MSDP tape I had, so that's been
updated on bitsavers, along with a bunch of other random tapes that were in the to
do pile.
23 Aug
23 Aug
7:15 p.m.
On 08/23/2014 06:47 PM, Al Kossow wrote:
It turns out 1/2" ID surgical tubing works just
fine stretched over the
tach roller.
It's a bit of a challenge getting it over the lip of the roller but once
it's
in place it fills in the gap where the original rubber was just fine.
Tygon is great stuff, just grippy enough. I use it on QIC tape drive
pressure rollers as well. Hopefully, it lasts longer than the original
stuff.
--Chuck
7 Sep
7 Sep
7:29 a.m.
On 8/23/14 6:47 PM, Al Kossow wrote:
It turns out 1/2" ID surgical tubing works just
fine stretched over the tach roller.
I was measuring some other things this morning and checked this. It's actually
3/8" ID
with a 1/16" wall.
I've run several dozen tapes through it, and managed to recover some 800bpi ones that
I really wanted the data from. Usual problem with the 9914 though, that they are not
tolerant of sticky tapes at all. The slightest slowdown and they throw a
"STUCK!"
error and stop.
I did manage to get one of my Qualstar drives aligned to the point where they can
barely read 800 tapes. They are more tolerant of stick, and it is my main drive for
1600/3200/6250 recovery, but they've never been very good at all on NRZI tapes.
For sticky 800 and below recovery, I'm going to have to go with A/D's and
recording
the tach info so I know exactly what speed the tape is rolling at.
--
Back to 3M cart recovery (more on that later in an update msg I'm working on).
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