On Mon, 2014-03-17 at 17:51 +0200, Lars Noodén wrote: > CDs and DVDs are physically different media than CD R and DVD R which > are in turn different from CD RW and DVD RW. CDs will last a long time, > as they have a layer of physically dented metal between slabs of > plastic. But you can't press one yourself. For anecdotes, I have some > pushing 30 years that play but I don't have MD5 checksums or anything to > verify them. > > I've had some CD R last only a few years, starting from the date of > manufacture not date of burn. The claim is 5 to 10 years, from date of > manufacture, but I have yet to see a date on the packages. CD R uses a > layer of dye which is then burned opaque. Those with higher quality > dyes should last longer before data loss begins but the dyes oxidize > over time and the rate depends on storage conditions and atmosphere. > About the only advantage is that they cannot be re-written so, while > they last, can serve as proof or evidence if a proper chain of custody > is also maintained. > > CD RW is more complex having a phase-changing layer but max out at a > theoretical 25 years under ideal storage and handling conditions, > starting from quality manufacturing. > > See: > http://www.clir.org/pubs/reports/pub121/sec4.html > > The longevity of flash is still a big unknown.
I made the best experiences with DVD-RAM. _When_ ever it was possible to write to a DVD-RAM the data was safe, _but_ many DVD-RAMs were broken, I payed a lot of money and the new once were already unusable, very often neither Linux nor Windows was able to write data to DVD-RAM or it needed hours just to write 1 KiB. And assumed you never ever will experience writing issues, when using DVD-RAM, what are 4.7 GB good for? How often will you split your tar files? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/1395078648.9232.215.camel@archlinux
