A 'Wafer Stack' is storage produced made by layering full silicon wafers. Unveiled in 1989 by Anamartic Ltd, this experimental "Wafer Stack" used reprogrammable logic to bypass faulty memory areas. It turns imperfect wafers into reliable high-speed storage. Each 6-inch wafer held 202 memory chips in a spiral layout, continuously self-monitoring and rerouting around failures. With up to eight wafers stacked, it offered capacities of up to 160 megabits—remarkable for the time.

Developed with Fujitsu and championed by Sir Clive Sinclair, the technology promised to revolutionise computers by eliminating chip packaging and waste. Though never commercialised, it foreshadowed today's solid-state drives and wafer-scale computing.