Dell Inspiron 17 (7737, Mid 2013) - Manual (Page 61)

eSATA
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USB Standards
USB 3.0 — This is also referred to as SuperSpeed USB. This port supports
data transmission speed of up to 4.8 Gbps and is backward compatible with
older USB standards.
USB 2.0 — Referred to as Hi‑Speed USB, it provides additional bandwidth
for multimedia and storage applications. USB 2.0 supports data transmission
speed up to 480 Mbps.
USB 1.x — Legacy USB standard supporting data transfer speeds up to
11 Mbps.
USB PowerShare — The USB PowerShare feature allows you to charge USB
devices when the computer is powered off or is in sleep state. The
icon
indicates that the USB port supports PowerShare feature.
NOTE: Certain USB devices may not charge when the computer is
powered off or in sleep state. In such cases, turn on the computer to
charge the device.
NOTE: If you turn off your computer while charging a USB device, the
device may stop charging. To continue charging, disconnect the device
and connect it again.
NOTE: On laptops, PowerShare feature stops charging the device when
the laptop battery charge reaches 10%. You can configure this limit using
BIOS setup program.
Debug Port — The debug port enables a user to run the USB 3.0 ports in
USB 2.0 mode temporarily for troubleshooting purposes and also when
operating system is reinstalled using a USB optical drive or a flash drive.
eSATA
eSATA allows you to connect external storage devices, such as hard drives
and optical drives, to your computer. It provides the same bandwidth as
internal SATA ports.
Your computer may have a standalone eSATA port or an eSATA/USB
combo port.