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I have a lightly used WESTERN DIGITAL Black 1TB USB 2.0/FireWire 400/eSATAExternal Desktop Hard Drive (WD10000H1CS-00). This item used and it does show some light scratches on the surface.
It was tested and does work. Still contains drivers/software for both Windows and Mac. Plugged into Windows10 computer and was seen without any additional drivers needed.
Here is some the product information from the label:
WD A/C adapter, USB 2.0 Cable, eSATA cable. When used with an eSATA port on a computer, it's as fast as the local hard disk!