Connected, but
missing from Finder.
See whether macOS lists a device, a disk or a volume — and how that differs from seeing it in Finder.
A clearer view of your connections
USB drive not
showing up?
Find out why.
Meet Port RJ for Mac. Understand USB devices, external drives and hubs — see what your Mac detects and choose a clear next step.
For macOS 16 and later
USB devices · External drives · USB-C hubs
Port RJApp interface
USB Flash Drive
USB storage · example device
- Device detected
- Storage available
- Volume not mounted
Mount volume
Requires confirmation
Designed around your Mac USB devices, drives & hubs Understand before taking action
Familiar problem. Clearer context.
Plugged in.
Still a question mark?
“It isn't showing up” can describe different situations. Port RJ helps you tell them apart.
Connected, but
Direct works.
Through a hub doesn't.
Compare a direct connection with the hub path. Follow a structured cable, port and hub A/B check.
An accessory
needs your attention.
Understand when an accessory-access setting may be relevant, with guidance for reviewing it on your Mac.
Here one moment.
Gone the next.
Use the connection-event view to follow arrivals and disconnects while you change one thing at a time.
How Port RJ works
Less trial and error.
More useful next steps.
A simple path from “what's connected?” to “what should I check?” You stay in control of each action.
See what your Mac detects.
Build a view of connected USB devices, disks and volumes. Start with what appears in the system rather than guessing from Finder alone.
Put the signals in context.
Review connection paths, disk and volume status, and relevant accessory-access guidance. A device being listed is a clue, not proof that it works correctly.
Change one thing at a time.
Follow clear checks for a direct connection, another cable or a different port. Compare what changes and keep a record of the steps you've tried.
Diagnostic context helps you investigate. It does not guarantee a repair, fix failed hardware or make every device compatible.
Inside Port RJ
A little clarity.
All in one place.
See the overview, diagnosis and activity views. Follow connected devices, understand their status and keep track of what changes.
Start with the connection map.
The overview brings detected USB devices, disks and volumes into one view. Follow each device through its connection path.
Open full-size image
Understand the signal, then choose a check.
Review device detection, storage availability and volume status. Choose a guided next step and confirm actions in the app.
Open full-size image
Keep track of what changed.
Follow connection and disconnection events while you compare cables, ports and hubs. Keep track of the changes during each check.
Open full-size imageInterface images show example devices and statuses. Device checks run in the Mac app.
Built around the investigation
Useful details.
Without the guesswork.
Port RJ brings the useful signals together, explains the situation clearly and guides your next check.
Follow the connection.
A view of detected USB devices and their connection paths, so you can distinguish a directly connected device from one behind a hub.
Mac→Hub→Drive
A disk isn't a Finder window.
Disk and volume information helps explain the difference between a detected drive, an unmounted volume and a volume visible in Finder.
A next step you can follow.
Guidance for reviewing relevant accessory-access settings and comparing cables, ports, a hub path and a direct connection. No instruction to disable macOS security.
Notice the pattern.
The event log records connection and disconnection observations while you investigate. It provides context for intermittent problems, rather than a guaranteed diagnosis.
How do I install Port RJ?
Choose Get Port RJ for Mac, open the installer and follow its instructions. If the installer is not available on this website, contact support for installation assistance.
What devices does Port RJ support?
Port RJ works with USB-connected devices, external storage and USB-C hubs on Mac running macOS 16 or later. USB-C describes a connection type; a connector alone does not confirm a cable's or device's capabilities.
Does “detected” mean a drive is working?
No. A listed USB device, a detected disk, a mounted volume and a volume visible in Finder are different observations. Port RJ makes those distinctions easier to understand. Detection alone does not confirm that a device, cable or file system is healthy.
Will Port RJ repair or reset a USB port?
Port RJ provides diagnostic context and guided checks. It does not promise automatic USB-port resets, power repair, recovery of missing files or a repair of damaged hardware. A guided investigation may still lead to a cable replacement, compatibility check or hardware-service enquiry.
Will I need to change macOS security settings?
Port RJ explains relevant accessory-access settings where they are available on your Mac. Review the specific setting and understand the choice. Port RJ does not ask you to disable macOS security or bypass an unexplained warning.
Does this website check my USB devices?
No. This website shows the app interface with example devices and statuses. It does not read your USB devices or change device settings. Open the Port RJ Mac app to check connected devices.
Let's make the next step clearer.
A question is
a good place to start.
Get help with installation, device status or the next connection check.
Contact support [email protected]Share a description of your question.
Keep passwords and private files out of your email.
