How do I check USB status on a Mac?

Open System Information (Apple menu, About This Mac, More Info, System Report) and select USB in the sidebar. Each device lists its negotiated speed, current draw, vendor, and product ID. For a live view that updates as you plug and unplug, USB Connection Information shows the same data from the menu bar.

How do I check USB status on Windows?

Device Manager, with View set to Devices by Connection, shows the controller hierarchy and which port each device sits on. Microsoft's free USBView tool shows more per-port detail. USB Connection Information shows live negotiated speed per device from the system tray.

How do I tell which USB port a device is plugged into?

On Mac, System Information groups devices under their bus and hub. On Windows, Device Manager's Devices by Connection view shows the same tree. The reliable trick on either platform is to unplug the device and watch which entry disappears.

Why does my USB device not show up at all?

A device that draws no power and appears nowhere is usually a dead cable or a charge-only cable with no data wires. Try a different cable first, then a different port. If it appears but immediately disconnects, the port may be over-current limited by other devices sharing the same controller.

Can I see how much power a USB device is drawing?

On macOS, yes - System Information lists the current available and current required per device in milliamps, and USB Connection Information shows live wattage for USB-C Power Delivery connections. Windows does not expose per-device power draw to applications.

How to Check USB Status on Mac and Windows

See what's connected to your USB ports and the state of each connection - negotiated speed, power draw, port assignment - on macOS and Windows.

Your computer knows a great deal about every USB device attached to it: the speed the link negotiated, how much current the device asked for, which controller and port it landed on, and who manufactured it. Almost none of that is visible in normal use. You get an icon on the desktop, or nothing at all.

This guide shows how to read the actual status of your USB connections on macOS and Windows - what’s available built in, what the limitations are, and how to get a live view.

What “USB status” actually consists of

When people go looking for USB status, they’re usually after one of five things:

What you want to know	Why it matters
Negotiated speed	The single most useful number. Reveals cable and port bottlenecks instantly.
Power draw / delivery	Whether a device is getting enough current, or what a charger is supplying.
Port and hub assignment	Which physical port, and what else is sharing its bandwidth.
Device identity	Vendor and product ID, serial number - what the thing actually is.
Connection events	Whether a flaky device is silently dropping and reconnecting.

Each platform exposes a different subset. Here’s how to get at them.

Checking USB status on macOS

System Information (built in)

Apple menu → About This Mac → More Info → System Report → USB in the sidebar.

You get a tree of every USB device grouped by bus and hub. Selecting one shows:

Speed - “Up to 480 Mb/sec”, “Up to 5 Gb/sec”, “Up to 40 Gb/sec”
Current Available and Current Required - power budget in milliamps
Vendor ID / Product ID - hardware identity
Serial Number, Manufacturer, Location ID

This is genuinely thorough. Its limitation is that it’s a snapshot - it does not update. Plug in a different cable and you must close and reopen the whole report to see the change, which makes swap-testing tedious.

Terminal (built in)

system_profiler SPUSBDataType

Prints the same information as text. Useful for scripting or pasting into a support thread. Add -json for structured output.

A live view

USB Connection Information puts the same data in the menu bar and updates it as devices connect and disconnect. The practical difference is swap-testing: you can change a cable and watch the speed change in place, rather than reopening System Report between every attempt.

On macOS it also reads what the built-in tools don’t surface at all - the full USB-C Power Delivery profile list a charger advertises, the contract actually negotiated, and live wattage.

What the Mac speed labels mean

macOS shows	Actual speed	Standard
Up to 12 Mb/sec	12 Mbps	USB 1.1
Up to 480 Mb/sec	480 Mbps	USB 2.0
Up to 5 Gb/sec	5 Gbps	USB 3.0 / 3.2 Gen 1
Up to 10 Gb/sec	10 Gbps	USB 3.1 / 3.2 Gen 2
Up to 20 Gb/sec	20 Gbps	USB 3.2 Gen 2×2
Up to 40 Gb/sec	40 Gbps	USB4 / Thunderbolt

Checking USB status on Windows

Device Manager (built in)

Right-click Start → Device Manager → View menu → Devices by Connection.

This is the important step most people miss. The default alphabetical view tells you nothing about topology; Devices by Connection shows the real tree - which controller, which hub, which device hangs off what.

What Device Manager gives you: hierarchy, driver state, and whether a device is erroring. What it does not give you: the negotiated link speed. There’s no speed column.

USBView (free, from Microsoft)

USBView ships with the Windows SDK and is also distributed standalone. It shows per-port detail including the device descriptor and the port’s supported speed - considerably more than Device Manager. It’s a developer tool, so the presentation is dense, and like System Information on the Mac it’s a snapshot rather than a live view.

A live view

USB Connection Information for Windows shows the negotiated speed per device from the system tray, updating as you plug and unplug.

One honest limitation to note: Windows does not expose USB-C Power Delivery detail or cable e-marker data to applications. Per-device power draw and charger profile analysis are macOS capabilities today. Speed, identity, and topology are available on both.

What the Windows speed labels mean

Windows shows	Actual speed
Full-Speed	12 Mbps
High-Speed	480 Mbps
SuperSpeed	5 Gbps
SuperSpeed+	10 Gbps
SuperSpeed+ 20Gbps	20 Gbps
USB4	20 or 40 Gbps

Reading the result: three common diagnoses

“My drive shows 480 Mbps but it’s a 10 Gbps drive”

The cable is the cause about nine times out of ten. USB-C cables carry no visual indication of their speed tier, and the one bundled with a phone is almost always USB 2.0. Swap it for a cable that explicitly states a Gbps figure, then re-check. Full procedure in device connecting at USB 2.0 speed.

“Two identical-looking ports behave differently”

Completely normal. Manufacturers routinely wire one USB-C port for Thunderbolt/USB4 and another for USB 3.2 or even USB 2.0, with no external marking. Check the status of the same device on each port and use the faster one for storage.

“The device disconnects intermittently”

Look at the topology view. If several power-hungry devices share one hub or controller, the port’s current budget can be exceeded, causing drops under load. Move the device to a port on a different controller, or use a powered hub.

The underlying point

Every one of these questions has a definite answer that your operating system already knows. USB feels unreliable mostly because that answer is buried four levels deep in a system report that doesn’t refresh - so people end up guessing, swapping cables at random, and blaming the device.

Read the negotiated speed first. It turns “this feels slow” into a specific, fixable fact.

USB Connection Information exists to keep that number one click away on both Mac and Windows - but everything above is achievable with built-in tools, and the diagnostic reasoning is the same either way.

Related guides

For real-time visibility into other kinds of connections your computer makes, see the rest of the Connection Information suite - audio, displays, and network.