spoken to teacher: 5-10 year is HIS interpretation, just to be on the safe side; comment went sumtin like this: Not much research yet on DVD thoug the analogy to laserdisk, cd AND the complexity of the structure hints that the long-time duration wil not be btter than former formats...
some, maybe useful info on digital conservation topics: -conservation of cd's (guidelines): ISO 16111 -Effect of marker pens on cd's: 'Leon Bavi Vilmont: Effect de marqueurs sur les CD-R, Etude CRCDG, Paris, 2002' -CD classification: NF 242-011-2 (i guess sumthing to do with CRCDG, see further...) says: only class 1 and 2 (i.e. Max block error rate lower than 50) can be considered for 'long term storage,' long term is more than 3 years. site: http://archivesdefrance.culture.gou v.fr/fr/texteno rme/dafperenisation.htm
its in french, but it links to other, international sites.
I'm afraid a lot of this might be already known to you, but, they call me ever-eager-to-serve..
The ozone layer has little to do with global warming, it blocks U.V., not infrared, the greenhouse effect is caused by the exhaust of CO2, that blocks reflected heat from the surface, while letting solar heat pass through (roughly speaking)
of course, as you stated, all good eco news can be an alibi for governments to keep spewing CO2, logic being not always the main drive in governmental behaviour (and i am being VERY polite here...)
No source (yet)
this course we take is relatively new, and our 'docent' (=teacher) is relatively old. 74, if you can believe it!
BUT he is NOT an idiot, admittedly he runs windows on a iMac, but, well...
The problem with his courses are that he is convinced that we can study better when he dictates from his syllabus, and we write it down...instead of handing it out and... well you get the picture.
At the end of the year we get the syllabus, but ive had a peek and it looks like he's gotten a lot of his info from the net and newsletters from around the world. it looked like unfinished, patched together...
he also has extensive emailcorrespondence with a variety of conservators AND he has the memory of an elephant, so i'm afraid he had it from some obscure article, like JAIC or something.
Suppose I AM A JACKASS...
But being from Bergium...
Actually, i'm going for a 'meestergraad' and i thought that was the same, but, nope i was wrong (did some confusing reading on our national errr... studysystem, and it is confusing to say the least;)
as i understand: master degrees are university grades (correct me if im wrong) but in belgium, the conservation/restauration disciplin is linked with art academies... Now, half of our teachers call themselves prefessors, and they want to change the... err.... grades to bachelor/master, instead of candidate/meester. those terms come from the old european tradition of guilds, i guess the still feel a bit proud about these things. But they (our would be prefessers obviously want to have a higher esteem internationally.
Bergian Engrish error 2: indeed, i meant medium of dvd instead of format (we Euros are soooo sloppy with english, we always think we have mastered it, but, well...
Hope you love spy movies...
The best system for longer-lived archivation (and excuse me my Engrish, i'm from Belgium...) is actually something we all know from those russian mumbling, raincoat-wearing types: MICROFILM!
Yeah, iknow...sounds funny, but seriously: a lot of musea et;c. are switching back to this old and trusted archival system. It's tried and tested, the information density is not that bad (compared to parchment, anyway,) storage, copying and retrieval is kinda straightforward, and thus relatively cheap, in comparison to digital storage, where you have not only to update your disks, tapes, what have you, but also your computers, readers,... at a very high pace (say ten years)
Microfilms are guaranteed reliable for over 100 years, and can be combined with ocr (if you want to swap computers every ten years (sigh)
Ok, it's far from ideal, and admittedly super-bulky, compared with DVD's and the like, but for valuable data, convenience has to make way for reliability.
Studying for a masters degree in conservation and restauration of visual media, we've just hit the subject of digital conservation.
guess what... 'It is recommended to make backups of DVD's every FIVE years, since the format cannot be considered stable for more than 10 years, even in ideal storage conditions'
the cracking of the plastic layer is inherent to the prodduction proces, figure that!
Seems that the alu/plastic bonds cause excessive strans because they have different expansion characteristics, so everytime they get a bit hotter/colder, the risk of cracking occurs.
furthermore, some plants use 'glues' that affect the alu layer, so it starts corroding.
kinda depressing all that...
Easy: If you check out the movies, only the ants can be seen doing something. All the other xperiments show just... errr... empty containers, or unintelligible noise; guess that's due to the severe compression used. (Or are those ants really huge, compared to the bees et.c.?)
Goes to show how visually oriented we folks are, these days... No pretty pics/movies= no news
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spoken to teacher: 5-10 year is HIS interpretation, just to be on the safe side; comment went sumtin like this: Not much research yet on DVD thoug the analogy to laserdisk, cd AND the complexity of the structure hints that the long-time duration wil not be btter than former formats...
u v.fr/fr/texteno rme/dafperenisation.htm
some, maybe useful info on digital conservation topics:
-conservation of cd's (guidelines): ISO 16111
-Effect of marker pens on cd's: 'Leon Bavi Vilmont: Effect de marqueurs sur les CD-R, Etude CRCDG, Paris, 2002'
-CD classification: NF 242-011-2 (i guess sumthing to do with CRCDG, see further...)
says: only class 1 and 2 (i.e. Max block error rate lower than 50) can be considered for 'long term storage,' long term is more than 3 years.
site:
http://archivesdefrance.culture.go
its in french, but it links to other, international sites.
I'm afraid a lot of this might be already known to you, but, they call me ever-eager-to-serve..
The ozone layer has little to do with global warming, it blocks U.V., not infrared, the greenhouse effect is caused by the exhaust of CO2, that blocks reflected heat from the surface, while letting solar heat pass through (roughly speaking) of course, as you stated, all good eco news can be an alibi for governments to keep spewing CO2, logic being not always the main drive in governmental behaviour (and i am being VERY polite here...)
No source (yet) this course we take is relatively new, and our 'docent' (=teacher) is relatively old. 74, if you can believe it! BUT he is NOT an idiot, admittedly he runs windows on a iMac, but, well... The problem with his courses are that he is convinced that we can study better when he dictates from his syllabus, and we write it down...instead of handing it out and... well you get the picture. At the end of the year we get the syllabus, but ive had a peek and it looks like he's gotten a lot of his info from the net and newsletters from around the world. it looked like unfinished, patched together... he also has extensive emailcorrespondence with a variety of conservators AND he has the memory of an elephant, so i'm afraid he had it from some obscure article, like JAIC or something.
Suppose I AM A JACKASS... But being from Bergium... Actually, i'm going for a 'meestergraad' and i thought that was the same, but, nope i was wrong (did some confusing reading on our national errr... studysystem, and it is confusing to say the least;) as i understand: master degrees are university grades (correct me if im wrong) but in belgium, the conservation/restauration disciplin is linked with art academies... Now, half of our teachers call themselves prefessors, and they want to change the... err.... grades to bachelor/master, instead of candidate/meester. those terms come from the old european tradition of guilds, i guess the still feel a bit proud about these things. But they (our would be prefessers obviously want to have a higher esteem internationally. Bergian Engrish error 2: indeed, i meant medium of dvd instead of format (we Euros are soooo sloppy with english, we always think we have mastered it, but, well...
Hope you love spy movies... The best system for longer-lived archivation (and excuse me my Engrish, i'm from Belgium...) is actually something we all know from those russian mumbling, raincoat-wearing types: MICROFILM! Yeah, iknow...sounds funny, but seriously: a lot of musea et;c. are switching back to this old and trusted archival system. It's tried and tested, the information density is not that bad (compared to parchment, anyway,) storage, copying and retrieval is kinda straightforward, and thus relatively cheap, in comparison to digital storage, where you have not only to update your disks, tapes, what have you, but also your computers, readers,... at a very high pace (say ten years) Microfilms are guaranteed reliable for over 100 years, and can be combined with ocr (if you want to swap computers every ten years (sigh) Ok, it's far from ideal, and admittedly super-bulky, compared with DVD's and the like, but for valuable data, convenience has to make way for reliability.
Studying for a masters degree in conservation and restauration of visual media, we've just hit the subject of digital conservation. guess what... 'It is recommended to make backups of DVD's every FIVE years, since the format cannot be considered stable for more than 10 years, even in ideal storage conditions' the cracking of the plastic layer is inherent to the prodduction proces, figure that! Seems that the alu/plastic bonds cause excessive strans because they have different expansion characteristics, so everytime they get a bit hotter/colder, the risk of cracking occurs. furthermore, some plants use 'glues' that affect the alu layer, so it starts corroding. kinda depressing all that...
Easy: If you check out the movies, only the ants can be seen doing something. All the other xperiments show just... errr ... empty containers, or unintelligible noise; guess that's due to the severe compression used. (Or are those ants really huge, compared to the bees et.c.?)
Goes to show how visually oriented we folks are, these days... No pretty pics/movies= no news