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2. Compact disc bronzing - Wikipedia

   en.wikipedia.org/wiki/Compact_disc_bronzing

   Compact disc bronzing. Compact disc bronzing, or CD bronzing, is a specific, uncommon variant of disc rot, a type of corrosion that affects the reflective layer of compact discs and renders them unreadable over time. The phenomenon was first reported by John McKelvey in the September/October 1994 issue of American Record Guide. [1][2]

3. Optical media preservation - Wikipedia

   en.wikipedia.org/wiki/Optical_Media_Preservation

   Optical disc types. CD-ROMs / DVD-ROMs (read-only-memory) are commercial grade discs and use a metallic data layer created using a molding machine that stamps pits (depressions) and lands (flat surfaces) into a polycarbonate substrate base. The metal layer is then applied to the base, creating the data layer. While aluminium is most frequently ...

4. Disc rot - Wikipedia

   en.wikipedia.org/wiki/Disc_rot

   Disc rot. Disc rot is the tendency of CD, DVD, or other optical discs to become unreadable because of chemical deterioration. The causes include oxidation of the reflective layer, reactions with contaminants, ultra-violet light damage, and de-bonding of the adhesive used to adhere the layers of the disc together.

5. Compact disc - Wikipedia

   en.wikipedia.org/wiki/Compact_disc

   t. e. The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. It uses the Compact Disc Digital Audio format which typically provides 74 minutes of audio on a disc. In later years, the compact disc was adapted for non-audio computer data storage ...

6. List of Compact Disc and DVD copy protection schemes

   en.wikipedia.org/wiki/List_of_Compact_Disc_and...

   SafeDisc (versions 1–5) Adds unique digital signature at the time of manufacturing which is designed to be difficult to copy or transfer so that software is able to detect copied media. SafeCast. The encryption key will expire after pre-determined date so the media can be used only temporarily. Also used to implement trial editions of programs.

7. CD-RW - Wikipedia

   en.wikipedia.org/wiki/CD-RW

   CD-RW (Compact Disc-Rewritable) is a digital optical disc storage format introduced in 1997. [citation needed] A CD-RW compact disc (CD-RWs) can be written, read, erased, and re-written. CD-RWs, as opposed to CDs, require specialized readers that have sensitive laser optics. Consequently, CD-RWs cannot be read in many CD readers built prior to ...