Comment on Hundreds of your Warner Bros DVDs probably don't work anymore

• xyzzy@lemm.ee ⁨1⁩ ⁨month⁩ ago

  Disc rot is a problem with LaserDiscs and early CDs. It’s a manufacturing problem, not something inherent in optical media. Generally the problem in the early discs is the adhesive.

  Blu-rays have a protective coating, unlike earlier formats. As an example, BD-REs record data by means of a kind of metallic spray and are expected to last for 20-50 years. Commercial discs, by contrast, are pressed, meaning data is physically etched into the disc. That means they’re expected to last significantly longer.

  The real problem will be the players.

  source

  • ryannathans@aussie.zone ⁨1⁩ ⁨month⁩ ago

    That’s cool, I thought dvds were pressed too

    source

    • xyzzy@lemm.ee ⁨1⁩ ⁨month⁩ ago

      They are, but disc rot in CDs and DVDs is typically caused by the aluminum reflective layer oxidizing, frequently caused by adhesive separation. Blu-rays were specifically designed to be more resilient; they have a silver alloy for their reflective layer instead of aluminum, and their protective layer is much thicker.

      (CDs have an ultra-thin protective layer. DVDs have a thicker one and are thus much less susceptible. Blu-rays have a significantly thicker layer than DVDs.)

      source