The eSATAp socket includes keyed cutouts for both types of connectors, ensuring that devices can only be plugged in the correct orientation for compatibility and functionality.

The USB Implementers Forum states it does not support any connector used by other standards, hence such 'combo' ports are to be used at one's own risk.

eSATA is a SATA connector accessible from outside the computer, to provide a signal (but not power) connection for external storage devices.

[3] eSATAp combines the functionality of an eSATA and a USB port, and a source of power in a single connector.

eSATAp can supply power at 5 V and 12 V. On a desktop computer the port is simply a connector, usually mounted on a bracket at the back accessible from outside the machine, connected to motherboard sources of SATA, USB, and power at 5 V and 12 V. No change is required to drivers, registry or BIOS settings and the USB support is independent of the SATA connection.

[citation needed] If advanced functionality such as a port multiplier is required, a PCI Express add-on card can be used.