On Tue, 2 Oct 2007, John Drescher wrote: > I have seen a few studies in the past (possibly cdfreaks) that show > that under torture tests that cd/dvd media is not very good. And that > cd/dvd media is also a very bad choice for archival because the media > breaks down over time. Personally, I have not seen this happen with > write once media as I have 10 year old cd-rs that still read fine > however I have had difficulty reading RW media.
This is interesting, I would have expected the other way round, as CD-R is dye based while CDRW is based on a high temperature state change. The caveat for CD/DVD storage is "in a cool dark place" - which most people tend to forget. I had to backup the contents of a CD jukebox a couple of years ago while we were clearing out old kit. All 500 discs inside were CD-Rs ranging from 5-9 years old. 3 were partially or completely unreadable with no obvious physical damage. Many more were touch-and-go to read (the noise made by the drives when they were retrying was quite noticable) which underscores why CD media has at least 4 copies of the recorded data on the actual disc surface. DVD-R/RW (both versions) haven't been around long enough for me to form a meaningful opinion on their longevity. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-users
