krat-tech

1984Microchip and the PC

Flash memory and SSDs

Flash memory keeps data without power and has no moving parts. Fujio Masuoka invented it at Toshiba in 1984. Today it is in every phone, USB stick and SSD.

A flash that erases

The name flash reportedly came from a colleague of Masuoka's, because erasing the memory reminded him of a camera flash. Toshiba initially paid little attention; Samsung and Intel later turned it into big business.

SSDs instead of disks

Around 2008 SSDs began replacing hard disks in laptops. The difference is huge: the computer boots in seconds and programs open instantly. Swapping an old disk for an SSD is still the cheapest way to revive an older computer.

Types

  • SATA SSD: 2.5-inch format, about 550 MB/s.
  • NVMe M.2: a small card directly on the motherboard, several GB/s.
  • SLC, MLC, TLC, QLC cells: more bits per cell means a cheaper drive but lower endurance and slower writes.

In 2026 SSDs became noticeably more expensive for the same reason as RAM: factory capacity goes to AI data centres.

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