On Thu, Dec 05, 2024 at 05:22:50PM +0000, Chris Green wrote:
As I understand it the slots in the M2 SSD connector can tell whether it's SATA or NVMe or both. I have an M2 SSD which I believe will work either with a SATA connection or with NVMe, and it has two slots in its connector.
The M.2 drive will be either NVMe or SATA, I've never heard of one that does both (would add cost for no benefit over two simpler cards). The M.2 slot can support one or the other or both. SATA drives will have two notches (B+M key), NVMe is usually one (M key), but there are two-notch drives (B+M key) intended to be usable in M.2 slots actually intended for low bandwidth network cards (B key slot without SATA support). The M.2 keying situation is generally a bit of a mess and there's no guarantee that a drive that physically fits into a slot will actually work, while there are configurations which logically work but need a physical converter. I assume this is because people did things not originally expected by the spec to allow more flexible use of slots, but the result is that the keying makes things more confusing rather than simplifying anything.
