It’s an inexpensive 2.5-inch SATA SSD, and it’s available all the way ... 2 slots — at least three, and sometimes five or more — but M.2 NVMe drives have also drastically dropped in ...
The best laptops are also upgradeable, which, for older laptops, means using 2.5-inch storage ... it came with an SSD.
For a long time, PC gamers fitting an SSD to their rig would have used a 2.5-inch drive with a SATA interface ... given the sheer popularity of NVMe M.2 SSDs, I'm a little sad to see it go.