SLC Write Cache (Dynamic NAND Cache)

SLC (Single-Level Cell) cache mode temporarily reprograms a portion of TLC or QLC NAND to store only 1 bit per cell, providing 3–4× higher write throughput during bursts before the data is folded back to the native TLC/QLC storage. Consumer SSDs implement either a static SLC cache (a fixed dedicated region) or a dynamic SLC cache (a variable portion of remaining NAND, shrinks as the drive fills). Samsung brands this TurboWrite; WD calls it nCache 4.0; Crucial uses Dynamic Write Acceleration. Most users rarely saturate the cache in daily workloads, but large file copies or game installation may exceed it.