SSDs with an “M-Key” have a single notch on the left-hand side and support NVMe with four PCI lanes, and this is most common on typical NVMe SSDs currently sold for desktop and laptop computers.ĭrives with two notches, both an “M-Key” and a “B-Key”, which is an additional notch on the right-hand side, support M.2 SATA or NVMe with two PCI lanes. This may restrict the host systems that can support them. PC motherboards often have sizing guides, either printed on their PCB or mentioned in the motherboard’s user manual, to show what SSD lengths they can accommodate.īut some M.2 SSDs that look identical to NVMe drives, are based on SATA technology, retain the older AHCI standard and aren’t anywhere near as fast.Īdditionally, M.2 SSDs have different “keying systems”, with notches placed at different physical positions along the edges of the connector. These module sizes are usually denoted by a code with the width followed by the length.Ī common size for most M.2 SSDs intended for use in desktop PCs and laptops (opens in new tab) is 2280, where 22 refers to the width and 80 refers to the length in millimeters. There are four possible module widths: 12, 16, 22 and 30 mm, and lengths ranging from 30mm to 110mm. The M.2 standard allows for SSDs of varying length and width, to allow them to fit into a variety of different computer cases.
There are numerous SSD sizes, shapes, connectors and form factors on the market, and this can be confusing for anyone who doesn’t closely follow the technology.
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