[QUOTE=Lenny_Nero;2511704]Any proof of this, a cite, or link …or is it just something you feel ?
I get thru a lot of MCC because of work (and if it (AZO) stops I dont know what we are going to do) and when I find a really good batch/box I have a 100 odd for my self to keep back for 3x3 burns of stuff that cant be lost.
As such I have some (well, quite a lot …as I look round at the two 600 boxes full of it) that are 5 plus years old and I have never seen an “unrecoverable read error” ever, which I take it you mean a POF, because if you are just talking about PIF errors then all media has them from day one.[/QUOTE]
YES, I actually have LOST DATA from a dvd disc… and not just to scratches and physical damage to a disc… and not JUST a crappy re-tread dye from generic brand, our beloved verbatims.
Here’s a link that generally talks about CD-Rs but the same apparent premise applies to DVD-Rs as well. You see, the technology had to EXIST in the mass market for that amount of time for the real-world wear to acutally show-up… so I’ve experienced this in real life when I was converting my cd-r collection to dvd-rs (thus SAVING valuable shelf space) any disc that was over 3 years old had a 50% or greater chance of being UNRECOVERABLE. These discs (for the most part) sat on a shelf in a disc binder case or in a spindle untouched until it was too late. Lucky, the data wasn’t important, however that leads me to make backups of things I’d like to keep a hold of a little longer. Most people began getting dvd recordable drives around 2002-2004 so the earliest discs are over 5 years old & that does not bode well if the premise about lifespans of discs is only SLIGHTLY better for dvds… putting the dye layer in-between two plastic surfaces does add a measure of protection, but only as good as the disc was sealed at the edges… if even the slighest moisture gets into the layer (over time) the process of decay will be rather quick (months) relatively speaking. I’ve also found out the hard way what they say about sun exposure as well is true.
The way I look at it is, a safe method is to keep copies of IMPORTANT DATA separate from your main “collection” both in plain sight (so you remember) and another locked away… then once every few years, recover the data & reburn them to keep a good copy fresh. After two-three copies the oldest ones can be destroyed and/or discarded if they no longer work. I have old analog vhs cassettes over 20 years which work as NEW, and yet cd-r media hasn’t standed the test of time… dvds might only be safer by a couple of years more… that said… I need to go through my collection to find my important data & buy some taiyo yudens. Then I’ll begin the experiement to see just how good the discs are, though I bet some of you may already know if one has failed due to degrading of the dye layer by now…