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Re: [AV Media Matters] Digitizing Audio and Video-ReallyBigPost
More on the matter:
I just spent a ferry ride back home discussing BU with an IT "guru"
type. He seems to think tape is the way to go, agrees that CDs are
really not a good idea; hard discs lose their magnetism over time
unless they are spinning. He suggests DLT; he doesn't like the idea of
AIT because as the head spins, there is greater risk of the head
becoming misaligned, and we all know what playing back a tape recorded
on a misaligned machine is about.
Since people are moving to super DLT, he suggests good deals are to be
had on e-bay. The reliability of DLT vs. SDLT is apparently the same.
As for my dislike of tape drop outs, apparently computer data tapes are
written with redundancies; there are also ways you can encode the file
previous to storing it to tape to further minimize chances of data loss
due to drop outs, etc. I believe he suggested Reed-Solomon encoding,
which I have found some info on here:
http://www.4i2i.com/reed_solomon_codes.htm
Also, he mentioned that any form of compression isn't a good idea, as
you have a greater likelihood of losing data.
He suggests restoring the tapes every 5 years or so (stored in climate
controlled environment), and if all is OK, then shelve it again for a
while and re-test. If there is a problem, keep working at restoring it,
and once you have the data (hopefully), do a new back-up.
Best,
Alyssa.
On Thursday, May 29, 2003, at 01:43 PM, Richard Hess wrote:
George,
While I'm speaking mostly from information provided by Sony, the S-AIT
tape (and I believe the AIT tape) use a "Diamond-like coating" or
"DLC" on
the read surface of the tape that is also sputtered on after the
magnetic layer. They've done this to protect the magnetic layer.
However, dry is still the operative word for storing ME tapes.
The S-AIT-1 tape I have in front of me has in the box "Recommendations
for use...2. operation and storage: Maximum Wet Bulb temperature 76.8F
(26C)
Magnetic field: below 4000A/m (or approx 80 gauss)
Extreme changes in temperature and humidity should be avoided whenever
possible."
Cheers,
Richard
At 01:16 PM 5/29/2003 -0400, George McBride wrote:
Jim and Alyssa,
Just curious to know if you have already discussed the fact that AIT
is
ME tape
while LTO is MP tape?
Regards,
George McBride
Jim Wheeler <Jimwheeler@aol.com> on 05/29/2003 09:53:37 AM
Please respond to AV-Media-Matters@topica.com
To: AV Media Matters <AV-Media-Matters@topica.com>
cc: (bcc: George McBride/Maxell)
Subject: Re: [AV Media Matters] Digitizing Audio and
Video-ReallyBigPost
Alyssa
DAT is in a world by itself so don't compare DAT with DataTapes. I
have
not
heard of any problems with LTO, Gold CDs, Gold DVDs, or HDDs made by
one
of
the "big three". I believe all of these are reliable.
MO has not been popular because of the pricetag. As a result, there
are
not
very many units in use. I do not recommend a format/medium that has
a
small
market-share. Blu-ray will have the same problems as CDs and DVDs
but
Gold
Blu-rays should be reliable.
Richard Hess mentioned the Sony S-AIT which is a possibility. This
is
a
new
format so I don't recommend it until it has been in use for a year or
two.
www.sony.com/datasystems
I do not recommend low-density stone carving.
BEST!
Jim Wheeler
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