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WHAT IS THE DVD+R STORAGE LIFESPAN
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leestrada
Junior Member
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30. January 2006 @ 01:51 |
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I have backed up over 600,000 mp3's as data and wonder how long this media will hold up?
I store the media in cd-r books that hold about 200 each inside my home at room tempature.
No sunlight or scratching of course!
Thanx
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AfterDawn Addict
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30. January 2006 @ 10:31 |
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Depending on the quality of the discs that you used ... well from what I've read anywhere from 5 to 100 years ...
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DogBomb
Senior Member
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11. February 2006 @ 00:29 |
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600,000 mp3s???????? That's about 55,000 albums/CDs!!!
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dilligaf9
Member
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11. February 2006 @ 07:41 |
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This message has been edited since posting. Last time this message was edited on 11. February 2006 @ 07:44
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AfterDawn Addict
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11. February 2006 @ 07:45 |
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Burned CDs Last 5 years Max -- Use Tape?
Posted by CmdrTaco on Tuesday January 10, @11:16AM
from the been-there-before dept.
Data Storage
Lam1969 writes "Computerworld has interviewed Kurt Gerecke, an IBM storage expert and physicist who claims burned CDs only have a two to five-year lifespan, depending on the quality of the CD. From the article: "The problem is material degradation. Optical discs commonly used for burning, such as CD-R and CD-RW, have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data 'shifting' on the surface and thus becoming unreadable to the laser beam." Gerecke recommends magnetic tapes to store pictures, videos and songs."
Storage expert warns of short life span for burned CDs
And don't count on hard disk drives for long-term storage, either
News Story by John Blau
JANUARY 10, 2006 (COMPUTERWORLD) - Although opinions vary on how to preserve data on digital storage media, such as optical CDs and DVDs, Kurt Gerecke, a physicist and storage expert at IBM Deutschland GmbH, takes this view: If you want to avoid having to burn new CDs every few years, use magnetic tapes to store all your pictures, videos and songs for a lifetime.
"Unlike pressed original CDs, burned CDs have a relatively short life span of between two to five years, depending on the quality of the CD," Gerecke said in an interview this week. "There are a few things you can do to extend the life of a burned CD, like keeping the disc in a cool, dark space, but not a whole lot more."
The problem is material degradation. Optical discs commonly used for burning, such as CD-R and CD-RW, have a recording surface consisting of a layer of dye that can be modified by heat to store data. The degradation process can result in the data "shifting" on the surface and thus becoming unreadable to the laser beam.
"Many of the cheap burnable CDs available at discount stores have a life span of around two years," Gerecke said. "Some of the better-quality discs offer a longer life span, of a maximum of five years."
Distinguishing high-quality burnable CDs from low-quality discs is difficult, he said, because few vendors use life span as a selling point.
Hard-drive disks also have their limitations, according to Gerecke. The problem with hard drives, he said, is not so much the disk itself as it is the disk bearing, which has a positioning function similar to a ball bearing. "If the hard drive uses an inexpensive disk bearing, that bearing will wear out faster than a more expensive one," he said. His recommendation: a hard-drive disk with 7,200 revolutions per minute.
To overcome the preservation limitations of burnable CDs, Gerecke suggests using magnetic tapes, which, he claims, can have a life span of 30 to 100 years, depending on their quality. "Even if magnetic tapes are also subject to degradation, they're still the superior storage media," he said.
But he's quick to point out that no storage medium lasts forever and, consequently, consumers and business alike need to have a plan for migrating to new storage technologies.
"Companies, in particular, need to be constantly looking at new storage technologies and have an archiving strategy that allows them to automatically migrate to new technologies," he said. "Otherwise, they're going to wind up in a dead end. And for those sitting on terabytes of crucial data, that could be a colossal problem."
http://computerworld.com/hardwaretopics/storage/story/0,10801,107...
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Senior Member
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11. February 2006 @ 19:02 |
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JoeRyan
Senior Member
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6. March 2006 @ 19:44 |
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The IBM physicist got a few points wrong--DVD+/-RW discs are not based on dyes. One can calculate the expected lifetime of a disc by subjecting it to extremes of heat (up to 85 degrees C.) and humidity (85% RH) for as long as 2,000 hours in repeated cycles and measure changes in error rates. There are two ways to measure: the Arrhenius method that uses only one set of stresses or the Eyring model that uses two. Good quality DVD+R discs are projected to last an average of 50 years with a 95% confidence level that they will last at least 39 years before error rates reach a level beyond error correction. CD-Rs with phthalocyanine dye can exceed 100 years because the dye is more stable than azo-cyanine used in DVD discs and CD-Rs are less susceptible to damage from humidity.
Tape can also last a long time--the oldest recorded tape will be 70 years old in November. The IBM guy was trying to sell 3480 and 3590 tape cartridges or 9-track reel tape, not something every consumer has in the living room.
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Member
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6. March 2006 @ 20:52 |
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Varies quite a lot between disc's of the same manufacturer.
Run batch scan's on your collection at Bi-monthly intervals and you can see the increase in PIF in discs across all brands (some more susceptible than others and some dyes of certain brands)
Using the same drive for comparison's. Around 70% of all discs over a period of 12 months have additional gains in PIF.
Manufacturers and technicians can make claims and counter claims, some makes/batches deteriorate fast (personal experience of Ritek G05 Printables), their views are often biased and tests flawed.
Doing periodic scans of my back ups (2500+, over 2y 4m ,taiyo Yuden/Maxell/Verb/Ritek/imation/infiniti) all still play, with 10% or so showing a poor PIF reading 70% showing a marked increase in PIF and 20% holding quality (some on cheaper brands like prodisc over 2y 4m old).
Impossible to say how long they'll last, my pioneer dvd standalone can handle and correct a high PIF where my other players struggle to handle 'bad disc's'.
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