Computer does not recognize USB: how to fix the problem step by step

It’s not uncommon to face an annoying problem: you insert a USB stick or an external hard drive and the computer seems to completely ignore it. No sound, no notification, no device detected. In these cases, panic can arise, especially if important files are on the USB stick.

But don’t worry: if the computer doesn’t read the USB, the causes can be easily fixed. In this guide, we will clearly see what to do, step by step.

Why doesn’t the computer read the USB stick?

The causes can be both software and hardware. Here are the most common ones:

Damaged or dirty USB port
Outdated, corrupted or not installed USB drivers
Insufficient power (typical with external hard drives)
Damaged or incompatible file system on the USB stick
Power-saving settings that disable the ports
Operating system problems managing USB devices

What to do if the USB is not recognized on Windows

1. Change port or computer

Try inserting the USB stick into another USB port or another computer. If it works elsewhere, the problem is with your PC.

2. Check Device Manager

Press Win + X → “Device Manager”. Expand “USB Controllers” and look for error signs. If you find any, right-click → “Uninstall device” → restart the PC.

3. Disable USB selective suspend

Go to “Power Options” → “Change advanced power settings” → disable “USB selective suspend”.

4. Use the troubleshooter tool

Search for “Troubleshoot” in Windows → select “Hardware and Devices” → start the scan.

5. Check in “Disk Management”

Is the USB stick visible but without an assigned drive letter? Assign it manually: right-click → “Change Drive Letter and Paths”.

What to do on macOS

1. Restart the Mac

Simple but often effective. Restart the system and reconnect the USB stick.

2. Check in Disk Utility

Open Disk Utility. If the USB stick is visible but not mounted, click on “Mount”. You can also try “First Aid”.

3. Reset the SMC

The SMC controls many hardware functions, including USB ports. A reset can help.

4. Check with another cable or adapter

If you use a USB-C → USB-A adapter, it might be defective. Try another one.

When the problem is the USB stick

If the USB stick does not turn on (no LED, no noise), it is probably physically damaged. In this case:

Avoid further attempts
Contact a data recovery center
Alternatively, try software like Recuva or Disk Drill

How to recover data from a non-working USB stick

Useful software:

Recuva (Windows): simple and free
Disk Drill (Mac and Windows): also supports unmounted disks
EaseUS Data Recovery: useful for damaged partitions

FAQ

Why won’t the PC read the USB stick?

Due to faulty ports, corrupted drivers, incompatible file systems, or power-saving settings.

How to make a PC read a USB stick?

Change ports, update drivers, disable selective suspend, and check Disk Management.

What to do if the USB stick does not open?

Check if it is detected, assign a drive letter, or use data recovery software.

How to recover files from a damaged USB stick?

With Recuva, Disk Drill, or by contacting a specialized lab.

Conclusion

A computer that won’t read a USB may seem like an insurmountable problem, but often just a few steps are enough to fix it. With some patience and the right tools, you can recover your files and be back up and running in minutes.