ALEXANDRIA, Va., April 21 -- United States Patent no. 12,609,135, issued on April 21, was assigned to Seagate Technology LLC (Fremont, Calif.).
"Tri-level magnetic recording of bits" was invented by Xiong Liu (Shugart, Singapore) and Quan Li (Shugart, Singapore).
According to the abstract* released by the U.S. Patent & Trademark Office: "Described are systems and methods for tri-level recording of bits on granular magnetic media, for example using a magnetic writer of a hard disk drive. Tri-level recording of bits involves recording magnetic states that can be read as three distinct levels by a magnetic reader. Tri-level recording within a single recording layer of the granular magnetic storage media can be accomplished by recording bits ...