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John DuBois
Guest
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 Posted:
Tue Dec 14, 2004 5:44 am Post subject:
Re: Archiving Solutions. |
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In article <hI3vd.339$Ei.224@newsfe3-gui.ntli.net>,
Dorothy Bradbury <dorothy.bradbury@ntlworld.com> wrote:
| Quote: | There is one other technology to consider:
o I would first caution that I prefer 2 media types v 1 expensive media type
o DLT has dropped in price considerably with the new slimline 40/80GB drives
o You can get a main-brand 40GB DLT drive for ~£450, probably $450-550
o Tapes are expensive, but their quality is real - the world uses DLT
DLT is Digital Linear Tape, derived from the big open reel systems.
It is different to tape systems developed from audio - eg, Digital Audio Tape
which is a Helical Scan technology which has improved but still =/= DLT. As
the cheaper (yet mainbrand, eg, Quantum) drives are now == DAT, it's DLT.
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This is the approach I'm taking. Each time I accumulate 40GB of images, I make
two backups onto 40GB DLT. One goes in the fire safe, the other goes in to
work with me. I'll end up with about 80 pairs of tapes, unless I switch to
some other system before I'm done.
I had endless problems with DAT drives, as did the company I work for. They
switched to DLT and never saw another read failure.
John
--
John DuBois spcecdt@armory.com KC6QKZ/AE http://www.armory.com/~spcecdt/ |
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John K.
Guest
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| Posted:
Wed Dec 15, 2004 4:24 am Post subject:
Re: Archiving Solutions. |
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| Quote: | What is the recommended way of archiving scans?
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1- Clean your originals using StaticVac; http://www.kinetronics.com/
2- Make shure that your scanner/computer setup get clean power, since
any noise in the line translates into noise in the A/D converter. A
PowerVar ower conditioner at minimum, or a Power Regenerator at best;
www.powervar.com
3- Profile and calibrate your scanner with an IT-8 target;
http://www.coloraid.de/
4- Scan in a ProPhoto RGB color space; (the scanner's raw color space is
proprietary and it may be difficult to have it in the future)
5- Scan at your scanner's maximum optical resolution in 48-bit/RGB
6- Avoid Processing such as sharpening, effects, etc (Do this on your
finals);
7- burn them on Medical Grade DVD-R using AccuBurn-R software, or XVA-2
data tapes. http://www.digitalfaq.com/media/dvdmedia.htm
and
http://www.infinadyne.com/accuburn-r.html
8- Store both the originals and data in a temperature controlled place.
Sounds overkill? Probably, but you asked for "Archive Quality". If you
want "Professional Quality" Then feel free to substitute 2 or 3 of the
above. If you want "Medical or Military Quality", then add: 9 - use an
ICG 360 drum scanner hooked up to a Balanced Power outlet. If you want
"good enough quality", then anything goes here. [you name it]. |
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Dorothy Bradbury
Guest
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| Posted:
Wed Dec 15, 2004 7:06 am Post subject:
Re: Archiving Solutions. |
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With fire safe's watch how the fire rating is achieved:
o Some use proper fireproofing materials
---- impregnated foams, saffill, treated concrete
o Some use a gel which is saturated with moisture
---- in a fire the gel is superheated to create steam
---- so the media is exposed beyond temp & humdity limits
Media safe's are relatively ok - and may be used in combination
with those gel type (paper usage) fire safes. However don't forget
to shut the media safe properly re ensuring the seal's integrity.
Going to investigate some of the archive grade DVD myself...
--
Dorothy Bradbury |
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David Chien
Guest
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| Posted:
Fri Dec 17, 2004 5:13 am Post subject:
Re: Archiving Solutions. |
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| Quote: | 7- burn them on Medical Grade DVD-R using AccuBurn-R software, or XVA-2
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The choice of DVD-R discs is even more limited if you want archival
quality and a quality burn. Here, it's pretty much the Made In
Japan-only Maxell DVD-R discs (I'm saying these are easy to buy vs.
other quality discs you may have to hunt forever to find).
These are top quality discs, have been through multiple revisions, and
have been tested by emedia & dv magazine and may other users and found
to be among #1 in compatibility across a variety of DVD players after
being burned in top-quality burners (not point using a medicore DVD
burner for archival purposes) for many years.
It's basically the same disc Apple uses (rebranded), and in a good
burner (eg. Plextor, Pioneer), they burn with low PI/PO error rates (see
www.cdrinfo.com for burner reviews with PI/PO error rate charts).
Other brands? Who knows.....
---
Besides this, also burn a second copy to any other brand/media
because you never know.....you may just lose the only one you have.
---
Finally, verify after writes (can be turned on in Nero DVD burning
program for example). This includes the physical media itself as well
-- here, use a LiteOn (or BenQ, etc.) burner with PI/PO read capability
(see www.rpc1.org -> forums for help on this).
You need to do this because a marginal disc that passes all verify
after writes is still a marginal disc. Here, you need to make sure the
PI/PO error rates are actually low enough not to cause a read problem in
the near future.
---
8 - add ot that humidity controlled as well. water can damage discs
faster than temperature....
---------
use a good burner. Pioneer A08 or Plextor 712 are solid choices as
they'll make good burns with low PI/PO error rates across a wide variety
of discs.
====
Here, burning to CD-R discs may be an even better choice.
Use Mitsui Gold CD-R discs (100% gold reflective layer) and you'll
ensure an even longer archival storage life than DVDs in general.
(partially due to the use of a non-gold reflective layer (ie.corrosion),
and also due to the glued construction of DVDs from two plastic discs)
CDs also have much higher compatibility, readablility, and so forth vs.
DVDs, which are more fragile and new as a technology. After all, almost
all PCs can read CDs, but quite a few PCs still can't read DVDs. |
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Dorothy Bradbury
Guest
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| Posted:
Sat Dec 18, 2004 12:36 am Post subject:
Re: Archiving Solutions. |
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| Quote: | they burn with low PI/PO error rates (see www.cdrinfo.com for
burner reviews with PI/PO error rate charts).
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Many thanks for that reference, very useful.
--
Dorothy Bradbury |
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