South Korean media report that JNTC is entering the market for glass platters used in hard disk drives (HDDs), a market long monopolized by Japan’s HOYA. JNTC has secured the capacity to produce roughly 120 million to 170 million platters and plans to supply Seagate. The two companies have been working together for years to bring JNTC’s glass platters into Seagate’s supply chain. JNTC plans to prioritize Seagate’s demand through 2030, then expand supply to Western Digital and Toshiba. JNTC expects the business to generate hundreds of millions of dollars in annual revenue. For context, the company’s total revenue last year was less than $200 million. JNTC said it expects HDD glass platter sales to start showing up in its results in the first quarter of next year. Current estimates suggest HOYA will eventually supply about 60% of Seagate’s glass platters, with JNTC supplying the remaining 40%. JNTC’s entry would mark the first crack in HOYA’s monopoly.