Flash in your pocket: how SanDisk helped turn non-volatile memory into a mass-market product
Long before phones routinely shipped with hundreds of gigabytes of flash storage, SanDisk was trying to make non-volatile memory practical enough to replace mechanical storage in small devices.
Eli Harari founded SanDisk in 1988, with Sanjay Mehrotra and Jack Yuan among the company’s co-founders. The business was built around flash memory systems rather than conventional hard disks.
Non-volatile memory solved a problem batteries could not
DRAM is fast but loses its contents when power disappears.
Flash memory keeps data without continuous power, making it attractive for portable electronics.
SanDisk’s early work focused on turning that characteristic into complete storage products and controllers rather than selling only raw memory chips.
Removable cards made flash visible to consumers
Digital cameras, music players, handheld devices and later smartphones created huge demand for compact removable storage.
SanDisk became closely associated with memory-card formats and retail flash products.
The brand helped make semiconductor storage understandable to consumers who had never thought about the technology inside a memory device.
Controllers mattered as much as NAND
Flash cells wear out and require careful management.
A usable solid-state storage product therefore needs controller firmware for error correction, wear levelling and mapping data across the memory.
SanDisk’s systems expertise became an important complement to the underlying flash technology.
SSDs brought flash into computers and data centres
As flash prices fell, solid-state drives began replacing hard disks in many performance-sensitive workloads.
SanDisk expanded into client and enterprise SSDs, moving from removable media into primary computer storage.
Western Digital bought SanDisk in 2016
Hard-drive maker Western Digital completed its acquisition of SanDisk in May 2016.
The transaction combined a large HDD company with a major flash-storage business at a time when solid-state storage was becoming increasingly important.
SanDisk co-founder Sanjay Mehrotra left after the sale and later became chief executive of Micron.
The brand survived inside Western Digital
SanDisk continued as a consumer flash brand even after the corporate acquisition.
Western Digital also used SanDisk technology and joint-venture manufacturing relationships to build a broader flash and SSD portfolio.
2025 made SanDisk independent again
Western Digital separated its flash business from its hard-drive operation on 24 February 2025.
The flash company became an independent publicly traded Sandisk Corporation.
David Goeckeler, who had led Western Digital, became chairman and chief executive of the separated Sandisk.
AI made flash capacity strategic again
AI infrastructure does not rely only on accelerators and high-bandwidth memory.
Training datasets, model checkpoints and inference systems also need enormous amounts of persistent storage.
This has renewed attention on NAND density, SSD performance and data-centre storage efficiency.
A familiar consumer logo with a semiconductor history underneath
SanDisk became famous through memory cards and USB drives, but its deeper history is about commercialising non-volatile storage at scale.
The 2016 Western Digital acquisition seemed to end its life as an independent company. The 2025 separation reopened that chapter.
For TechnologyBlog.co.za, this history page becomes the natural backlink anchor for future Sandisk memory-card, SSD, NAND and storage coverage.
Sources reviewed include Sandisk’s 2025 separation FAQ, current company information and historical SEC filings on the founding team. Facts are current to 18 September 2026.
