A hard drive is the same physical size if it has 1 Tb to 5 Tb, same with memory sticks, usb drives, SD cards. It would seem logical that memory/storage “modules” hold a specific amount of data, and you just need more of them to store more data.
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Look at what’s inside the 2.5 inch ssds. 128gb models are tiny. It’s just a plastic box around that.
M.2 ssds get bigger as they get more capacity.
With the rest, as others said. Physical constraints. They want all their usb sticks to be the same size, sd cards have a standardized size and so on.
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