I guess many of us remember this from the floppy disk age, where you’d have disks go bad after a couple of years, but after a reformat, ready for use again. Environmental factors (which includes reading) serve to speed up or slow down this process. So the -RW media may have a longer lifespan than -R media (note they use very different physical materials). After that period, you can throw the -R away, but the -RW can simply be erased & rewritten. For example a recording on -R may last for five years, one on -RW only two years. However, for the media itself, this is reversed. For instance for optical discs, I’ve read that recordings on CD-R are usually more durable than those on CD-RW. Therefore you should distinguish between the media, and the recording. Think of it like this: every read has (for a *tiny* part) a similar effect as erase. That was totally new to me, but FYI: optical storage suffers from the same problem. Static wear-leveling algorithms address this by periodically moving stale data to new blocks.” This means that if data sits for too long in a block and is read too many times, the data can dissipate and result in data loss. “In addition to a maximum number of Erase cycles, certain flash devices suffer from a maximum number of Read cycles between Erase cycles.
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