ALEXANDRIA, Va., July 3 -- United States Patent no. 12,346,562, issued on July 1, was assigned to Sandisk Technologies Inc. (Milpitas, Calif.).

"Non-volatile memory bitmap for garbage collection" was invented by Liang Li (Shanghai), Xuan Tian (Shanghai), Ming Wang (Shanghai) and Jiahui Yuan (Fremont, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Technology for managing non-volatile memory. A bitmap may be maintained in NAND memory cells. The bits in the bitmap map to an address (e.g., PBA) in the NAND memory cells. Each bit has either a first value to indicate that the corresponding address stores valid data or a second value to indicate that the corresponding address does not store value data. Garba...