back to article Good gravy, Toshiba QLC flash chips are getting closer

Toshiba is pushing flash chip capacity higher on two fronts: through, er, Through Silicon Vias (TSVs) and by increasing a cell's bit count to four. We covered the TSV notion here and now take a look at quadruple level cell (QLC) flash technology. Toshiba will present on this and TSVs in a keynote session at the August 8-11 …

  1. A 15

    Possible erratum

    The article says that the relationship between number of (binary equivalent) bits that a gate can hold and the number of separate states, between which it can distinguish is a factor of two:

    binary bits | distinct states

    1 | 2

    2 | 4

    3 | 6

    4 | 8

    This is surely false! the relationship between number of binary bits b that can be represented by a gate that can distinguish n states is: n=2^b or b=log(n)/log(2).

    i.e.:

    binary bits | distinct states

    1 | 2

    2 | 4

    3 | 8

    4 | 16

    1. diodesign (Written by Reg staff) Silver badge

      Re: Possible erratum

      Thanks - we've tweaked the article. Please don't forget to email corrections@theregister.co.uk if you spot any problems.

      C.

  2. Anonymous Coward
    Anonymous Coward

    Sandisk PLUS 240GB G.26

    Sandisk have just sadly switched the very good budget Sandisk Plus (120GB-480GB capacities) G.25 which was an MLC to cheaper and smaller TLC, and changed the controller too.

    Sandisk obviously felt the need to ditch a good product, then use the branding to sell an inferior, cheaper to produce version of the SSD. The modern day form of bait and switch.

  3. Toastan Buttar

    4 bits per cell tech is so last decade.

    SanDisk had a 43nm 4-bits-per-cell (x4) die in production in the noughties.

    https://www.sandisk.co.uk/about/media-center/press-releases/2009/2009-10-13-sandisk-ships-world%E2%80%99s-first-flash-memory-cards-with-64-gigabit-x4-(4-bits-per-cell)-nand-flash-technology

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