SSD capacity has not expanded at the same pace as hard disk drives over the years, for a simple reason of physics. While hard drive makers found newer ways to cram more data onto disk platters, NAND flash memory capacity has been somewhat capped.

SSDs originated with SLC memory, which meant one bit per cell. Eventually that expanded to two and three bits per cell, but pretty much stopped there. You can only put so many cells in a memory chip, so the only way to increase capacity meant more chips, and more chips meant more cost.

For that reason, many people went with the simple solution of a small SSD as the C: drive and a standard hard disk for storage. It works even if it is a little annoying because Microsoft defaults all of the documents locations to the C: drive.

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