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Thanks. The molex-sata power adapters don't have 3.3v
then. Do SATA drives need 3.3v?

Yes. But if they are fed 5v they will use that and convert it down
internally.

As you surmised, a 4-pin Molex has 12v (yellow), two 0v (black) and 5v
(red). A SATA power connector has an additional 3.3v wire (orange).

What you MUST NOT do, if the drive has both Molex and SATA power
connectors on the back is connect both. Either is fine but never both.

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