From: arne@vajhoej.dk   
      
   On 12/2/2025 7:25 PM, Rich Alderson wrote:   
   > =?UTF-8?Q?Arne_Vajh=C3=B8j?=  writes:   
   >> But a search in c.o.v confirmed that it was the RA81's.   
   >>   
   >> 2003 post:   
   >>   
   >>    
   >> The problem with the RA81's wasn't that the drives were really flaky --   
   >> there were some early data and noise problems ECO's out under warranty   
   >> early on -- but that the glue that held the HDA filter was substituted   
   >> without a close look at the specifications of the glue.   
   >>   
   >> The substituted glue on HDA's at Rev F (IIRC) would liquify at warm   
   >> temperatures and flow to the bottom of the HDA and crash head 13   
   >> into the bottom platter every time.   
   >>    
   >>   
   >> 2021 post:   
   >>   
   >>    
   >> The early RA81s had a problem where the heads would "unglue" from the   
   >> actuator and totally trash the disk.   
   >>   
   >> DEC actively hunted out and replaced those original drives. The   
   >> replacement RA81s were good and ran forever.   
   >>    
   >   
   > Odd.  That's exactly what I remember about the RA82!   
      
   It even made it to this:   
      
   http://sysengr.engr.arizona.edu/publishedPapers/LessonsLearned.pdf   
      
   (page labeled 42, second column about 3/4 down)   
      
   Arne   
      
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