Dual M.2 SATA 2.5" Adapter
This is probably the weirdest—and potentially most useful—adapter I tested: it fits in a 2.5" drive bay but holds two M.2 SATA SSDs and can do RAID 0/1 or a span, plus JBOD in the right setup. JBOD needs SATA port multiplication support (which many onboard controllers don’t have), but hardware RAID 1 worked fine and kept my data accessible even after I pulled a drive.
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