Seagate's 20TB HDD product implemented heat assisted magnetic recording (HAMR). WDC and Toshiba have announced in the past couple of years that they plan to supply HDDs using microwave assisted magnetic recording (MAMR). Seagate has projected that HAMR would enable 30TB HDDs in 2023 with 50 TB HDDs possible by 2026. WDC or Toshiba are likely to introduce their own HAMR or MAMR HDDs in 2021.