CD corrosion

Karen C. Driessen (
Wed, 18 Mar 1998 16:36:44 -0700

I am forwarding this to the list from my music librarian even though it
does not directly pertain to video. I know sometimes there are people on
the list who may have responsibility for CD collections and may have missed
this on the music listservs.

" This message is for anyone who owns CDs with the following labels which
were issued from 1988 to 1993 by PDO (Phillips and Du Pont Optical):
Hyperion, Helios, ASV, Pearl, Unicorn.

These English labels are subject fo corrosion that will result in the
sonic deterioration of the discs. The corrosion is easy to both see and
hear. Affected discs show an unmistakable coppery-bronze coloration on
the TOP side (not the clear playing side). The corrosion begins at the
edges and progresses toward the center. Very badly corroded aeas will be
almost all noise or simply not track at all. Only discs issued from 1988
to 1993 are suspect."

Free replacements are being offered by PDO. You can contact me if you want
information about how to replace defective discs.

IMS has identified three such discs in our collection to date.

Karen C. Driessen, Director Phone: 406-243-2856
Instructional Media Services FAX: 406-243-4067
Mansfield Library E-mail:
The University of Montana
Missoula MT 59812