How to determine which slot a SSD is connected to

The upper SSD in the picture uses B+M key, while the lower SSD uses M key Why do they use different keys? The reason is that they use

: I want to upgrade my laptop with an SSD but I can't identify the type of slot it has, It looks like it is an

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what time do they stop selling lottery tickets in california Again, like Z97 it's a mixed bag on that platform As for vertical slots, the only motherboard I know of that has one is the X99 Deluxe