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"I would like to thank you for the superb work for the 16" Transcription. We are especially thankful for the faster turnaround time you provided, which was above and beyond the fastest selected option that we chose. Our 92 year old cousin was able to hear it before her serious decline. Also, I wanted to let you know that the History Center in ..."

Recording Preservation Tips - CD's

  • Compact discs should be stored in their cases vertically on edge, perpendicular to the shelf.
  • Environmental conditions recommended for other media are adequate for long-term storage of CD's
  • Always hold the disc by its edges to help keep the surface clean.
  • Use a clean, soft, dry cloth to remove any loose particles of dirt, dust, oil, or fingerprints. When cleaning the CD, never wipe it in a circular motion. Use a straight movement from the center outward to the rim.
  • An air gun should be used to blow off any light surface dust.
  • If fingerprints or other stains must be removed, 0.25 part of Tergitol 15-S-3 and 0.25 parts of Tergitol 15-S-9 per 100 parts of distilled water can be utilized safely. Carefully blot the area of the disc needing washing with a soft cloth (preferably a soft cotton that has been washed several times) imbued with a concentration of Tergitol and distilled water. Rinse well using a second cloth soaked in distilled water. Blot dry using a soft cotton cloth. Use an airgun to blow off any lint left over.  Avoid rubbing in any direction.
  • Do not clean the surface with any cloth soaked in water, solvents (thinners, benzine), silicon cloths, antistatic sprays, or record cleaner sprays.
  • Do not use a hair dryer to blow dust off or to remove any moisture from the disc surface.
  • DO NOT:
    • Place pressure-sensitive tape, VelcroTM, etc. on the disc.
    • Leave the CD in the drive overnight.
    • Bend the disc.
    • Write on or mar the surface in any way.
    • Make the center hole larger.
    • Scratch the surface of the disc while loading or unloading the player or storage case.
    • Store or place the disc in a heated area.
  • CD trivia: The CD track is thinner than a human hair and is about three miles long, beginning at the center of the disc and spiraling out to the edge.
  • CD's have an effective track density of 16,000 tracks per inch.
  • After the information transfer is completed, a transparent layer of plastic is applied to the information side to protect the polycarbonate substrate, a reflective coating placed behind the information surface, and then a protective lacquer applied.
    • The compact disc is a laminate of 4 different materials. The bottom of the disc is made of polycarbonate onto which the pits containing the digitized sound information are stamped. A thin layer of aluminum is then applied, covering the pits. A thin lacquer coating (which becomes the top of the disc) is then applied to cover the aluminum layer, and finally the ink for the labeling