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The second SATA lane is routed to the M.2 connector primarily to support M.2 SATA SSDs. It is possible, however, to get a M.2 card that exposes the SATA lane as a SATA connector. There is no internal source for powering the connected drive and there is no room to house this second drive within the chassis (in fact, the chassis may not even be able to close with this M.2 card installed).
Thanks for your reply, that's exactly what I was looking for.
Can you point me to where I can get such a M.2 card (that exposes the SATA connector)?
[ EDIT: I found this item SATA HDD to M.2 NGFF Socket Adapter Converter Card: Computers & Accessories is this it? ]