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01 ·Device Physics·★ MEMBER·12 min read The Physics of NAND Flash — Remembering by Trapping Electrons Why does a memory stick keep your photos with the power off? Starting from one idea — trap electrons on an island of insulator and shift a threshold voltage — this article builds up tunnelling writes, multi-level cells, 3D stacking and wear-out, and ends where you can read an SSD datasheet and a SMART log for yourself.