Is it possible for SSD firmware to act “progressively” from SLC to MLC to TLC and to QLC (and maybe PLC in the future)? E.g. for a 1TB QLC SSD, it would act as SLC for usage under 256GB, then MLC under 512GB, then TLC under 768GB, and then QLC under 1TB (and PLC under 1280GB).
It's theoretically possible, but in practice when a drive is getting close to full what makes sense is to compact data from the SLC cache into the densest configuration you're willing to allow, without any intermediate steps.
