Name Without Retelling Flashs Block Erase Displacement for Bulk Storage

# Name, Without Retelling, Flash's Block-Erase Displacement for Bulk Storage

## 12. What Eventually Displaced EPROM and EEPROM for Bulk Storage

EPROM and EEPROM's commercial niches — development-cycle firmware storage and small configuration data, respectively — held for roughly a decade before a third architecture, flash memory, began displacing both for bulk, high-density storage. Flash's defining architectural idea was block erase: instead of erasing a single byte (EEPROM) or the entire die at once under a UV lamp (EPROM), flash erases data in larger fixed blocks electrically, trading away EEPROM's fine erase granularity in exchange for dramatically lower per-bit cost and much higher density at scale. This series does not retell that architecture's own history here — Toshiba's Fujio Masuoka and his flash memory work, and the full NAND-versus-NOR architectural tradeoff, floating-gate and charge-trap storage physics, and Fowler-Nordheim tunneling detail, are already told at length in this site's own live NAND Flash Memory article. What belongs here is only the boundary fact: flash's block-erase architecture is what ended the particular EPROM/EEPROM commercial split described across this series, not a retelling of how flash itself works.