It’s not about getting data as dense as possible. It’s about cost. Hard drives are much cheaper than solid state storage per unit of storage. The best deals are around $15 per TB while a 1 TB microsd card is several hundred dollars.
You can get those massive densities with a hard drive like physical size. There are solid state drives that are tens of terabytes but they cost thousands to tens of thousands of dollars each.
Lol this isn’t engineering wtf.
Solid state data storage like an SD card and magnetic storage like a hard drive are fundamentally different technology; this is like asking why a VHS Tape needs to be bigger than a Blu-Ray despite the latter having a larger capacity.
The reason they both exist is that they have different characteristics and use cases. An SD card is slow but physically compact, a HDD faster than an SD but far larger and probably cheaper. An SSD is faster than both, smaller than a HDD but bigger than an SD and more expensive than both.
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