Stephen Gold | Distinguished Engineer
Sandisk Technologies, Inc.

Future of Memory and Storage - Day 3 @ 08:35

QLC Direct Write - Improved QLC write power efficiency for high-capacity solid state drives

As QLC SSD performance increases every generation, the problem of how much power is used for writes becomes increasingly important. QLC NAND typically exhibits slower write performance than TLC NAND (which can mean increased write power). QLC writes are normally a two-step program called “foggy-fine”, but generally the first “foggy” write is not readable and that data must be protected against power failure. The standard protection method is to copy the data into an SLC cache until the data is fully programmed into the NAND, but this has material write power/performance impact.We present QLC Direct Write – a novel approach that eliminates the need for an SLC cache to protect the host data until the QLC program is complete. This technology means that the data is in a readable state after the first step program, so no additional PLP protection is needed.Direct Write avoids the power impact of writing and reading the SLC cache, allowing better write power efficiency. It also eliminates SLC Cache OP impact (which would consume a portion of the drive NAND capacity), which means for random write workloads the SSD Write Amplification is lower which can further boost performance

Stephen Gold, Distinguished Engineer, Sandisk Technologies, Inc.

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Stephen Gold / QLC Direct Write - Improved QLC write power efficiency for high-capacity solid state drives

Stephen Gold, Distinguished Engineer,
Sandisk Technologies, Inc.

Stephen Gold is a SSD portfolio architect, driving architectural solutions for Sandisk's next-generation enterprise SSD product line. Stephen also drives Sandisk's enterprise ecosystem strategy, working with partners and enterprise SSD customers to imagine and architect new solutions to...

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