From: kingdon@panix.com   
      
   > Hard drives on 'Deep Space' missions: any idea why they are never used?   
      
   Reliability would probably be a problem.   
      
   But more interestingly, spinning a drive would change the attitude of   
   the spacecraft (a la reaction wheels).  I think there may have been at   
   least one mission which avoided this by having two drives spinning in   
   opposite directions.  But given the alternatives to hard drives these   
   days, I'd be quite surprised to see this done now.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)