From: spamtrap42@jacob21819.net   
      
   On 2025-05-30, bad sector  wrote:   
   > On 5/29/25 23:17, Robert Riches wrote:   
   >> On 2025-05-30, bad sector  wrote:   
   >>> On 5/28/25 8:01 AM, Rich wrote:   
   >>>> bad sector  wrote:   
   >>>>> I hadn't used any blu-ray since the early 'failures' epoch and was   
   >>>>> surprised to see 'archival' quality printed on a small stack that I just   
   >>>>> bought. Don't really know what the 'archival' difference is but there   
   >>>>> seems to me a strong market for the 25gb frisbies.   
   >>>>   
   >>>> Assuming "archival" is not simply a word inserted by the marketing   
   >>>> department without any backing, "archival" for optical media usually   
   >>>> refered to the use of dyes that were supposedly stable over a longer   
   >>>> term time range.  With the intent being that the dyes are not supposed   
   >>>> to fade over just a few short years of storage.   
   >>>   
   >>> It's from Verbatim, not a fly-by-night outfit but I havent' found any   
   >>> 'details' as to exactly what makes them archival.   
   >>>   
   >>> "Stored data is engraved on a patented inorganic write layer – it will   
   >>> not fade or deteriorate. Engraving process renders these archival grade   
   >>> discs practically impervious to environmental exposure, including light,   
   >>> temperature and humidity"   
   >>>   
   >>> Fot the price you can buy a cheap 1tb ssd and make it host 40 backups of   
   >>> your 25gb data, but what happens to things magnetic or electic during a   
   >>> pole flip? What makes them good backups is that you cannot accidentally   
   >>> delete an entire folder (got the T-shirts) ...they're not even in the   
   >>> computer once done.   
   >>   
   >> YYMV, and longevity likely differs from initial reliability, but   
   >> after I had used Verbatim brand DVD+/-Rs and BD-Rs for some   
   >> years, I got annoyed by somewhere around 10%-20% of my burn   
   >> attempts becoming coasters--and buying a new drive because I   
   >> suspected the laser was going blind.  I bought three packs of   
   >> Verbatim, PlexDisc, and MicroBoards 25G BD-Rs and kept track of   
   >> how many coasters vs. good burns I got from each brand.  Verbatim   
   >> had a high coaster rate.  The other brands had nearly zero   
   >> coasters.  I am basing my future purchase decisions on those test   
   >> results.   
   >>   
   >   
   > Sounds reasonable. By becoming coasters do you mean that right off the   
   > bat they were duds (failing verification) or that sometime later they   
   > failed to check out the content compared to the source? I haven't used   
   > enough of them in my life to constitute any form of database (maybe 200   
   > since they first appeared in the 90's).   
      
   With the Verbatim BD-Rs that became coasters, the burn would fail   
   and error out within the first several seconds.   
      
   I should add to my to-do list to find some of my oldest BD-Rs   
   that are still around and make sure they can be read and   
   uncompressed.   
      
   --   
   Robert Riches   
   spamtrap42@jacob21819.net   
   (Yes, that is one of my email addresses.)   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)