From: dan@djph.net   
      
   On 2025-05-14, Daniel70 wrote:   
   > On 14/05/2025 1:22 am, Kerr-Mudd, John wrote:   
   >> I wouldn't trust the wear limits on an ssd card. Can I open it up and   
   >> resolder it into a proper spinning rust Hard Drive?   
   >>   
   >> Jeez. Still, it's a bit of fun.   
   >>   
   > "the wear limits"?? What 'wear'?? Turning gates from 'One' to 'Zero'!   
      
   Yes, actually.  Writing to a flash chip physically degrades the floating   
   gates, because you need to use a comparatively high voltage to cross the   
   insulating layer between the floating gate and control gate.  For   
   example, if normal operating voltage of the thing is 1.8 volts, you   
   might need 6 volts to write.  Eventually this degrades the insulation   
   enough that you get bit-errors.   
      
      
   Realistically though, there are enough memory cells (plus spares) that   
   you can write the full capacity of the drive once a day, every day for   
   about 18 months straight -- usually the "total bytes written" is   
   on average about 400x more than the stated capacity.  Or, if you're   
   using it like the "average person", it's somewhere on the order of 5-7   
   years; which is about on-par with spinning rust (yeah yeah, I know   
   everyone has that drive that's been in their 486 toaster since 1990 and   
   is still "working fine").   
      
      
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