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What type of connector is this ?
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Looks like that's actually "SATA Express," which has lanes for both PCI and SATA - if you look at the other side of the connector (which you should have already shared!) you'll see even more contacts. You can get either a PCI or SATA adapter in order to use the drive.
Edit: Probably SAS as others said. It uses the exact same connector, which is why I made that guess.