Originally posted by JeffWld
If the high failure rates claimed in this thread are any indication, then the entire range of optical media technology should be considered a write-off since data loss would seem inevitable. The new HiDef technolgy actually pushes the limits of optical media to require an integrity and performance level which appears impossible if we are to accept the claims made here about less complex media types.
I guess I should consider myself lucky. After archiving over 5000 discs in the last 4 years, periodic tests and checks have never turned up a single piece of media that has failed over time. This includes more marginal bargain-priced media as well. Heck, I can't even get a failure on my fake Maxells that I deliberately exposed to extreme conditions in an attempt to induce corrosion or shifts in the dye stability. I've tried to kill test discs...and failed.
You know Jeff, I've never had a reason to doubt you. 5000 disks in 4 years sounds like you've been working full time on it too. I mean honestly, you can't be watching in a single task every disk because that's about 250 full time work weeks if those disks were all DVDs. So would I be wrong in asking if a goodly number of those were CDs?
The real point being, is that you stated that periodic tests and checks have never turned up a single piece of media that failed over time. And you haven't acknowledged exactly what kind of checks you made or over what period. Lacking that, could I assume that if you made checks on 1x burns from 2 years ago, that what you would do is pop them into your favorite DVD player, and chapter skip from the first to the last, and then return it to its sleeve? Because if you use that method, then I have 50 failed disks that will pass muster and play perfectly for you.
One of the problems that people don't get, is that bad disks often play fine in the better players. That doesn't make them good disks, because bad disks may NOT play in players that are poor readers. That's what it took for me to find out I had a problem. I had 50 disks that played fine in several players. When I added my newest player, an I-O Data LinkPlayer2, I had 50 disks that could do anything from play through to the end without problem, or could freeze at chapter 19 with my guests wondering, WTF?
The whole point of measuring for parity errors, is to find an objective measurement about which you can form an accurate opinion about a disk. For the test to be meaningful, a result of good should be playable and a result of bad should be expected to have problems. If the test doesn't give that measure of dependability, then it's a waste of time.
What I found, is that the test DOES accurately predict what I can expect. If it reports good, it plays good, on anything. If it reports bad, it may still play good on some players, but not all.
Below is a scan of a 1x burned disk from two years ago that failed the current test. For all I know Jeff, the disk might have been a bad burn from day 1. It will STILL play fine in some players, but not all.
But because I was not testing my disks in this way 2 years ago, I cannot say that it was rot over time. And because it plays fine in some players now, I cannot say the burn is any worse now than two years ago. But what I can say, is all the bad burns were made on the same equipment that is still making good burns today, on newer media.