reply to Robotics
Re: Can No Longer Read DVD/CD's It's worthwhile to note that scratching the *top* of the disc is actually far more likely to render a disc unreadable/unusable than scratching the bottom is.
The same idea applies to the markers. Light scribe has fared better so far since it utilizes a special layer independently of the burn layer which is, of course, isolated. Light scribe hasn't been around long enough to stand the test of time but a consumer CD that still works after 10 years is really pushing it in my opinion.
Bottom line - no media should be a sole backup solution. Ever.