The new 4 TB 4-bit QLC SSD by Samsung comes with a 3-year warranty period and has a level of performance similar to the company's 3-bit design. The new SSD for consumers provides read speeds of up to 540 MB/s and write speeds of up to 520 MB/s. This drive arrives more than a decade after Samsung's 32 GB 1-bit SLC SSD that was introduced in 2006.
https://www.notebookcheck.net/Samsung-begins-mass-production-of-industry-s-first-4-bit-4-TB-SSD-for-consumers.321190.0.html