Type of media - archival versus consumer - accounts for some of the variance in data life. Not all of these estimates "include the effect of the storage container ... [and] instead assume that the case is inert." Ask your photographer what type of media they're using for your CD/DVD and if the sleeve or case is safe for long-term storage. Also check to see if the insert is acid- and lignin-free.
"Assuming a good initial recording and proper care, consumer grade media can last from one to five years. Professional or industrial-grade media can last from five to 75 years. True archival-grade media, often with a reflective layer of gold, can last 75 to 200 years [Peterson]." Knowing what type of media you're starting with, allows you to backup your memories for safekeeping.
Here are some tips for how to protect your memories:
Do
- Label a CD/DVD using a CD/DVD safe pen.
- Store CD/DVD in Polypropylene jewel cases, vertically - not flat. ("[T]he little clip in the middle of the jewel case actually holds the CD/DVD away from both sides of the case so that the recording surface only contacts air. [Peterson]")
- Store out of direct light.
- Handle CD/DVD by the edges.
- Wipe them off periodically with a clean, soft, lint free, dry cloth - wipe in a straight line from the center of the CD/DVD toward the outer edge.
- Keep dirt, fingerprints, smudges, etc. from the CD/DVD. Use CD/DVD cleaning detergent to remove stubborn dirt or material.
Don't
- Touch the surface of a CD/DVD.
- Handle CD/DVD with dirty fingers.
- Bend CD/DVD.
- Label a CD/DVD using a pen that contains solvents (i.e. permanent markers), a pencil, or a ballpoint pen.
- Label a CD/DVD with an adhesive label. "According to 3M, an adhesive label may react with the CD/DVD [Dutton]."
- Peel off or reposition a label. "According to 3M, ... removing the label ... can damage the information layer of the CD/DVD by allowing contaminants to penetrate the protective coating [Dutton]."
- Store CD/DVD in a plastic sleeve. (If you're not sure if your sleeves are acid-free, check the box; if there's a warning, don't use them for storage. TYVEK® envelopes can be used.).
- Wipe CD/DVD in a circular direction.
Reference Sites:
- SaveMyMemories.org
- Adler, Linda, and Lesueur, Jr., Alex. "Focus On Photo Care and Preservation. (PDF)"
- Atkins, Bob. "Digital Data Preservation - CDs and DVDs for archiving digital images."
- Dutton, Gail. "Caring for Your CDs."
- Mizen, Ph.D., Mark B. "A Consumer Guide to Recordable CDs and DVDs. (PDF)"
- Peterson, Tom. "Answers to Your Questions about CD/DVD Archival Capacity and Testing."
- Weston, Miles. "Protecting, Caring For, Sharing Personal, Family Moments, Memories: Digital Photos, Videos Can be Enjoyed Forever, Lost in a Moment!"