What SSD type supported by HP Elitebook 840 G1?

I want to install a SSD on my HP 840 G1. But not sure which SSD is compatible with the port available on Motherboard. I thought it's mSATA but some one told me it's 42mm M.2 2242 type SSD. But that type of SSD is B type i.e. has two gaps on the connector. However the motherboard has one gap. I'm really... show more I want to install a SSD on my HP 840 G1. But not sure which SSD is compatible with the port available on Motherboard. I thought it's mSATA but some one told me it's 42mm M.2 2242 type SSD. But that type of SSD is B type i.e. has two gaps on the connector. However the motherboard has one gap. I'm really confused.
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