ALEXANDRIA, Va., June 4 -- United States Patent no. 12,321,640, issued on June 3, was assigned to PHISON ELECTRONICS CORP. (Miaoli, Taiwan).

"Memory management method, memory storage device and memory control circuit unit" was invented by Yen Chen Yeh (Hsinchu, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A memory management method, a memory storage device, and a memory control circuit unit are disclosed. The method is for a rewritable non-volatile memory module including first type physical units and second type physical units. The first type physical units adopt a first operation mode. The second type physical units adopt a second operation mode. The method includes: grouping a part of physical un...