M.2 Slot Types & Sizes

What Is M.2 Slot | M.2 Slot Types & Sizes:  https://www.electronicshub.org/m-2-slot-types/

" The most common M.2 key types are M, B, and B+M, and they differ in the number and position of the notches on the connector."

Types of M.2 Drives & Slots: https://www.cgdirector.com/types-m2-drives-slots/

"Nowadays, you can purchase SSDs in one of two form factors: 2.5" drives that are connected through the SATA interface or, alternatively, M.2 ones that are much smaller, require no cabling, and can achieve far greater read and write speeds."

" NVMe SSDs are the fastest you can buy these days and they almost always come in the M.2 format."

M.2 vs. NVMe: What is the difference when it comes to SSDs?  

    https://www.digitalcitizen.life/m2-vs-nvme-ssd/

"M.2 is a form factor that spells out the physical size and shape of the card that can be plugged into an M.2 slot."

"... if you see an SSD being described as NVMe, do not assume that it is automatically using the M.2 form factor. Also, if you see an SSD described as being M.2, don't assume that it is using NVMe."