[HN Gopher] Micron's 232-layer NAND enables 2TB flash chips that...
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       Micron's 232-layer NAND enables 2TB flash chips that deliver data
       50% faster
        
       Author : samizdis
       Score  : 54 points
       Date   : 2022-07-26 20:54 UTC (2 hours ago)
        
 (HTM) web link (spectrum.ieee.org)
 (TXT) w3m dump (spectrum.ieee.org)
        
       | Robotbeat wrote:
       | At what point will the wear resistance be so low from increasing
       | the layers (and bits) per cell that flash becomes effectively
       | write-once, read many (WORM)?
        
         | hinkley wrote:
         | Levels per cell and wear I understand. What's the link between
         | circuit layer depth and wear?
        
         | lazide wrote:
         | Keep in mind, these are layers of cells, not multi-level cells.
         | Each of the layers has an individual multi-level cell.
         | 
         | That said, Samsung quad-level cells only have 1k write
         | lifetime, so likely not far off.
        
           | hinkley wrote:
           | I love how someone said there's a septuple-level cell out
           | there... but you have to immerse it in liquid nitrogen for it
           | to work.
        
             | __alexs wrote:
             | PLC NAND is already on the way to commercial hardware.
        
           | mritun wrote:
           | Remember, even 1000 writes means roughly 3Y of full drive
           | writes per day with the naive wear leveling and the most
           | brutal write load. For most write loads the drives made of
           | this kind of NAND can be easily warranted for 3Y.
        
             | lazide wrote:
             | Yeah, 1K is still in the range of reasonable (if the wear
             | leveling isn't terrible), another order of magnitude
             | decrease though and we're getting on the edge of not.
        
         | Dylan16807 wrote:
         | Increasing layers should cause roughly zero problems.
         | 
         | As far as bits per cell, 4 already gives you very slow writes
         | and not a lot of them. Let's say that maxes out at 5 or 6.
        
           | [deleted]
        
         | dale_glass wrote:
         | There was a paper a while back that promised a healing process
         | for flash:
         | 
         | https://www.zdnet.com/article/self-healing-flash-for-infinit...
         | 
         | I have no idea what happened to that though, because it sounded
         | extremely promising.
        
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       (page generated 2022-07-26 23:00 UTC)