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I need to know what sort of compatibility eSATAp (Power over eSATA) ports have with SATA 2 and SATA 3 drives. I'm helping a friend get an external for his laptop and he has an e-sata usb combo port on it that we intend to use. Wikipedia claims it'll work with SATA 3, but I was looking for something more concrete.

This seems related Dell eSATAp not working with some SATA disks

Does this mean it can run just about any SATA drive, so long as there is an external power source for the external drive?

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I have used the eSATA port on a Dell Latitude E6400 and E6500 without any problems. Both with a pendrive (throttle 16GB), an external case with a WD black 320 (laptop drive) and via a eSATA dock (power!) for 3.5 inch WD black drives. Granted, neither of those are precisely E6420, but they are the older models of the same set. – Hennes Nov 7 '12 at 21:14
I'm using this $10 cable - eSATAp to SATA power and data on the other end. I have an OCZ Agility 3 SSD (120GB) attached to it. – Sun Oct 27 '14 at 22:19
up vote 2 down vote accepted

You are right, it will work with any sata, there are even some adapters. It's an esata with aditional power from usb, but you can use regular esata connector.

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