Kioxia is researching HLC flash chips for future SSDs.  So far, only 100 transcripts will last

Kioxia, the second largest manufacturer of NAND flash chips after Samsung, presented at the International Memory Workshop 2022 the first memory cell capable of storing 7 bits of information, and thus 128 voltage levels. A year ago, it was the same company that was the first to demonstrate 6-bit cells.

Both technologies will help to increase the capacity of SSDs, memory cards or internal storage in mobile phones. But both are also years away from real deployment. Just like last year, Kioxia had to perform the demonstration in laboratory conditions and cool the chips with liquid nitrogen – 196 ° C, because the materials are unstable at room temperature. Eventual hexa and hepta level cells so they may be waiting for a new generation of transistors that will no longer be built on silicon.

In addition, such memories will require increasingly complex controllers, which will also need to grow and be more expensive, so that it may sometimes be more advantageous to use more simpler NAND chips than fewer denser ones.

Kioxia does not yet give a rough estimate of when memories with 6- and 7-bit cells could start mass production. Today, we are still waiting for the 5-bit ones, which according to Western Digital will not be on the market until 2025. Of course, with longer cells, their lifespan is shortened, so it is not recommended to use such memory where many writes are expected (typically for system SSDs).


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Source: PC Watch via Tom’s Hardware

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