In 1980, a Toshiba engineer named Fujio Masuoka filed a Japanese patent for a new kind of semiconductor memory. It was electrically erasable like EEPROM, but instead of erasing one byte at a time, it wiped an entire block at once — quickly enough that a colleague joked it was "like a camera flash." The name stuck. The US version — US Patent 4,531,203, "Semiconductor Memory Device and Method for Manufacturing the Same" — was filed in February 1981 and granted in July 1985.

The trick was the floating gate: a scrap of polysilicon completely surrounded by insulator, sitting inside a MOSFET. Electrons tunneled onto it through a thin oxide layer and stayed there for years — a single bit stored as trapped charge, no power required. Kahng and Sze at Bell Labs had proposed the floating gate back in 1967 (US 3,500,142), but Masuoka's contribution was architectural: organize cells into blocks that share erase circuitry, dramatically shrinking die area per bit and making high-density non-volatile memory economically manufacturable.

Toshiba was underwhelmed. Masuoka was reportedly moved to a training role, given minimal resources, and forced to develop the technology partly on his own time. He presented NOR flash at IEDM 1984 in San Francisco — where an Intel engineer in the audience immediately grasped the implications. Intel shipped the first commercial flash chip in 1988, three years before Toshiba got its own product to market. In 1987, Masuoka came back with a second act: NAND flash, which sacrificed random-access speed for even higher density, exactly the tradeoff mass storage needed.

His reward from Toshiba for inventing what became a $60+ billion annual market? Reports put his bonus at roughly $500. He left for Tohoku University in 1994 and later sued Toshiba under Japan's employee-invention law; the case settled in 2006 for around ¥87 million — a fraction of his employer's earnings.

Modern relevance is almost too obvious to state:

• NAND flash is the storage in every SSD, USB stick, SD card, smartphone, tablet, dashcam, drone, and game console. A 2 TB microSD card is roughly $150 — that's a trillion Masuoka cells on a fingernail.
• NOR flash stores firmware in cars, routers, appliances, and IoT devices — anywhere code has to be there the instant power hits.
• The mobile revolution couldn't have happened without it: spinning platters won't survive a jog, and DRAM forgets when the battery dies.
• Modern 3D NAND (Samsung, Kioxia, Micron, SK Hynix) stacks 200+ layers of floating-gate — or charge-trap — cells vertically. It's Masuoka's block architecture rebuilt as a skyscraper.
• Even AI training clusters depend on NAND: an H100 node reads training data from NVMe SSDs made of billions of Masuoka's cells.

The historical irony is sharp. Masuoka published, patented, and demoed the technology years before anyone shipped it — and watched a competitor commercialize his own invention faster than his own company would. The block-erase idea seemed like a modest EEPROM refinement in 1980. It turned out to be the substrate on which the entire post-hard-drive world runs.