July 1, 1997: Whirlygig | June 30 | July 2 | 1997 | FOTD Home |
Fractal
visionaries:
What is the most reliable medium for long-term storage of digital
data? In other words, where does one store those glorious
fractals with the assurance that they will still be there in five or
ten years?
I'm no longer so certain.
I have just tried to recover about 350 old images that I thought were
safely stored away on a SyQuest 88mb cartridge. I had
intended on
recoloring them and bringing them up to my present standards, but when
I tried to read the cartridge, I discovered that the fractals had
vanished. I even tried the cartridge in three other
drives.
No luck. The cartridge had lost its format; the pictures were
gone.
I am not totally out of luck, however, because I still have two copies
of the parameter files safely stored away on good old (sometimes)
reliable 1.44mb floppy disks. Of course, this means a couple
hundred hours of redraw time, but eventually I'll have the original
fractals once again in my possession.
The reason for the disappearance of the fractals will likely never be
known for certain, but I have a pretty good idea what
happened.
The cartridge was stored on a shelf located about one foot, through a
wall, from a television antenna ground wire. I believe that
the
antenna was struck by lightning recently, and I suspect that the
magnetic field associated with the surge of the discharge through the
ground wire was so strong that it damaged the cartridge. The
fact
that several blank but formatted cartridges on the same shelf also have
lost their formats would lend credence to my suspicion. So
don't
store your digital data near lightning rods.
(Five-thousand years ago, the Egyptians had an archiving technology
that has lasted until this day, and may last five-thousand years
more. They carved their data in stone. Today, we
can't even
preserve data for five years. This is some
progress. Of
course, we have much more data than the Egyptians ever dreamed of, but
perhaps that is part of the problem.) :-)
I remember seeing a thread in this group a few weeks ago about the most
reliable long-term storage medium -- something about a medium immune to
magnetic disruption. I've still got those letters filed away,
so
when I finish here, I'll see what I can turn up.
Now it's time for today's fractal -- a different type of
image.
This one is notable in that it consists entirely of trapped
points. If the inside fill were set to 0, the result would be
a
blank screen. The fractal itself is the inside of a Julia set
that just misses an area of chaos, but comes close enough for the
nearby chaos to do strange things to the blank interior -- things which
the proper fill option can reveal.
Those with a bit of idle time might try different fill options -- they
all give interesting results. Changing the maxiter and/or the
periodicity also changes the image. Of course, the finished
product has been posted to a.b.p.f. and a.f.p.
Tomorrow, perhaps I'll get back to those way-out oblique
planes.
We'll see when the time comes.
Jim Muth
jamth@mindspring.com
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