SSDs come in various form factors (such as 2.5") and interfaces including Serial ATA (SATA), Serial Attached SCSI (SAS) and the newer NVMe PCIe which directly connects storage to the server’s CPU.

From creating a Raspberry Pi media server and a NAS-berry Pi ... Connecting an old SATA or NVMe SSD to a Raspberry Pi will require adapters, but you also have the option to use an external ...