SLC, MLC, TLC, QLC, PLC… NAND flash memory has been developed all the way, with higher and higher capacity density, lower and lower costs, but more and more stale performance and life. It has to rely on various technologies and master control optimization. Support, but still not optimistic.
TLC is still the mainstream flash memory type currently on the market. QLC did not perform well after being popular for a while, and many manufacturers returned to TLC.
The most typical is some ASUS notebooks. Last year, they were criticized for using Intel QLC flash memory SSD 660p series. This year, they replaced the whole line with TLC, which became a publicity selling point. Although Intel has successively launched upgraded SSD 665p and SSD 670p series, but few people are interested.
Today, Intel has sold its flash storage business to SK Hynix, but before the completion of the transaction, R&D and products are still continuing. At the end of last year, it also launched a 144-layer stacked QLC for the first time. Products include SSD D7-P5510 for the data center market. /D5-P5316, for consumer-grade SSD 670p, for notebook hybrid acceleration Optane H20.
At the recent ISSCC International Solid-State Circuit Conference, QLC flash memory seemed to have been forgotten by everyone. Only Intel was discussing this topic. The technical details of the 144-layer QLC were announced, while Samsung is still at the 92nd floor. SK Hynix, Western Digital /Kioxia is 96 floors.
The single Die capacity of Intel’s 144-layer QLC flash memory is still 1Tb (128GB), but the area has been reduced from 114.6 square millimeters by a full 35% to 74.0 square millimeters, and the storage density has therefore increased from 8.9Gb per square millimeter to 13.8Gb per square millimeter.
Performance indicators are also comprehensively improved: I/O transmission speed is increased by half to 1.2Gbps, programming throughput is increased to 40MB/s, programming latency is reduced to 1630us, reading latency is averaged 85us, maximum 128us, and erase block size is reduced by half Is 48MB.
Such parameters are naturally far superior to the old 9x-layer solutions of other companies.
However, Intel did not mention a word about the read and write life of the 144-layer QLC.
In fact, Intel has always been interested in further 5-bit PLC flash memory, believing that it is the key to SSD’s superiority to HDD in terms of cost in the future. With E1 form factor, it can achieve 1PB (1000TB) of single disk capacity.