As my statement about cleaning could be taken either way this is my pre-existing statement on my tips files "Cleaning CDs, DVDs etc Always clean data/audio or video CDs in a radial sense, not circumferentially, so that any microscratches are across and not along the data paths."
Go more slowly than that, on the order of 4X/8X burns if you want longevity.
I store my discs in a dark, cool and dry place on shelves in their cases.
So far the best longevity I've seen is from paper, hard disks, CDs, QIC80 backup tapes or even carefully stored floppies, in that order.
I was really a little astounded when I unearthed some QIC80 cartridges and found that nearly all were readable. Only one was not, and it was because the tape had rolled into the cartridge. It could probably have been fixed. Of course, the QIC drive is so simple, and as long as the rubber drive roller is good, it ought to work.
In my experience, DDS and SDLT tapes have proven to be unreliable even after as little as three years of storage.
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