Those drives are SATA inside the case.
That depends on the brand. The lower priced brands, yes, those can be SATA, the more vertically integrated companies also make custom PCBs that just have USB-C without any SATA interface exposed internally.
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That depends on the brand. The lower priced brands, yes, those can be SATA, the more vertically integrated companies also make custom PCBs that just have USB-C without any SATA interface exposed internally.