SSD Form Factors by SNIA

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Solid State Drive Form Factors
SSDs are commonly used in client, hyperscale and enterprise compute environments.  They typically come in three flavors:  NVMe, SAS, and SATA. Since SSDs are made from flash memory, they can be built in many different form factors. This resource guide is designed to provide information on the most common and current SSDs in their various form factors. In addition to the form factor dimensions, information such as use case, interface, protocol, and mechanical/electrical and connector specs are provided.

Form factors: 
• EDSFF
• M.2
• 2.5-inch (U.2)
• Add In Cards