Yes, I'm on 110V.

That's the one slight difference. Mine doesn't have a 2 prong plug but a 3 prong with the 3rd one not being used.

Just moving your plug over raises a concern. With this power supply the outside pin is the hot wire while the center is neutral.

I'd probably just pick up one of those cheap ata/USB adapters and just use the power supply that comes with it to power the SCSI drive

That's exactly what I was thinking! Moving the connector may switch it between 110/220V.
Maybe waynestewart , you could have a look at the position of that plug (I assume you are on 110V).

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