On August 31, 2017, SanDisk unveiled a revolutionary 400GB microSD card. This dime-sized powerhouse holds up to 40 hours of raw 1080p video—a storage density that would have stunned experts just a decade ago. But is 400GB the limit? Can we pack even more into this tiny 5 square millimeter space?
Device slots can't grow larger, so the path forward lies in shrinking transistors further through advanced manufacturing.
Theoretically, transistors could shrink to a single molecule. On August 14, researchers achieved stable monomolecular transistors at room temperature. Though mass production remains distant due to complexity, this hints at 5nm transistors on the horizon.
Crucially, transistors occupy three-dimensional space, allowing denser stacking as they shrink. SanDisk leveraged 2017's 10nm tech with 25 layers—each holding about 16GB—to reach 400GB.
With 5nm processes, 1TB microSD cards become feasible, likely marking the practical limit for now. We probably won't need more in the near term.
Do you see a need for over 1TB (or even 400GB) on microSD? Share your thoughts in the comments!
