I don't recall the source article I saw last year, but I did read about weakened data over time on CD's and other magnetic media. The other interesting issue is the lifespan of data storage technology. How many of us just purchased a computer with 5 1/4 inch floppy drives, either 180 or 360 K capacity, or with a floppy drive for 3 1/2 inch disks? I also have a pile of 100 and 250 zip disks sitting around with no drive to read them! External hard disks have replaced my CD data backups for 2005. Who knows what next year's new data storage will be?