Can't mount home burned dvd-rw

At one point things were fine. I could mount my dvd-rw with .avi files on them. I had burned them myself and could watch them with Quicktime & flip4mac. Now the dvd's won't mount. The Mac says they are blank dvd's. What is up with that? I am trying this on the PowerBook G4.

David Pogue wrote about this, he's had trouble with DVDs being that age (4 years & under) not reading anymore! try a different computer - newer mac or PC, if one is available to you.
http://pogue.blogs.nytimes.com/2008/12/10/homemade-dvds-going-going-gone/

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