[RndTbl] Optical media longevity warning
trevor at tecnopolis.ca
Wed Oct 27 23:54:31 CDT 2021
On 2021-10-23 Adam Thompson wrote:
> ...so here's a periodic reminder that the centuries your optical
> discs were supposed to last? Let's call that *highly optimistic at
> I know several people reading this who back up to optical media, but
> only one (maybe two) who plan for media longevity.
Funny, I recently did a little study of my own and was going to make an
article about it or something. Still probably will.
I've been backing up to CD-R and DVD-R for about 15 years. So I took
the oldest 500 discs a while back and started running checksums on the
all to see if any had problems (and compare against original checksums
I still have).
So far I have 1 CD that seems to be having issues. Out of hundreds.
And since my backup system breaks things up into 10-20 chunks per disc,
my loss of 1 file is only about 50MB. I am still trying to figure out
if anything else might be going on (i.e. physical damage).
All in all they seem to hold up even better than I had expected.
On 2021-10-24 Hartmut W Sager wrote:
> It was pointed out that, longevity aside, you need compatible reading
> hardware later to read the discs. For both reasons, I re-write (copy
> to elsewhere) everything every 2-3 years. I no longer use CD-R/DVD-R
Funny, that's exactly what I do. My program is currently set to
rewrite every 5 years. I started at 2 years, but as I went on without
issues I kept upping it to save media. I use a mix of cheapo and
datalife plus. So far there doesn't seem to be much difference in
reliability to be honest.
Optical media: the only backups that will survive an EMP! :-)
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