The first is a SATA SSD, which comes in a 2.5-inch form factor and connects to your motherboard with the same cables and ports as a SATA HDD. The second (and newer) is the M.2 SSD.

To test the SSD or HDD on your Windows computer for potential problems, you can use multiple native tools. One of the most flexible ones is chkdsk. It's a command-line utility designed to diagnose ...