macOS Sequoia Not Recognizing USB Drive? Try These 13 Fixes

author avatarIvelin Krastev Hours Posted on Hours Updated on

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Is your USB drive not recognized on macOS Sequoia? Many Mac users face this frustrating issue, especially after updating to the latest version.

Whether it’s a flash drive, external disk, or another USB device, it’s tough when your Mac fails to detect it.

This can disrupt workflows, prevent access to important files, and even affect your backup processes.

But don’t worry—there are several solutions to help you get your USB devices working again.

Let’s dive into the solutions so you can quickly resolve any connection issues and get your USB devices back up and running smoothly on macOS Sequoia.

But first:

This Article Contains:

What causes USB device issues on macOS Sequoia?

When macOS Sequoia fails to recognize a USB drive, it can be due to several underlying issues. Here are some common reasons your USB devices might not be recognized:

  • Faulty or incompatible USB ports or cables
  • Flash drive formatted with an unsupported or corrupted file system
  • Insufficient power supply to the connected external drive
  • Security and privacy settings blocking access to USB flash drives
  • Hardware failure in the USB flash drive/external drive
  • Unstable system settings following the update to macOS Sequoia

Identifying these common issues can help you pinpoint the source of the problem and quickly resolve it.

Next, we’ll explore practical fixes to get your USB flash drives recognized on macOS Sequoia.

How to fix macOS Sequoia not recognizing USB drives

If macOS Sequoia isn’t recognizing your USB drive or is disconnecting from it, try these troubleshooting steps to get your USB devices working again.

Each solution is easy to follow and helps address different issues that could be affecting the connection.

1. Check the USB port

Begin by testing the USB port where you’ve connected the USB drive. Ports can wear out or even malfunction over time, so testing multiple ports is a straightforward way to rule out physical damage.

  • Try plugging the USB drive into another USB port on your Mac desktop or MacBook. If you have multiple types of ports (e.g., USB-C and USB-A), test both to see if there’s a difference.
  • If possible, use the same port with another flash drive (like a USB flash drive) to confirm if the port itself is functional.
  • Make sure that no dust or debris is blocking the USB port. Sometimes, small particles can disrupt the connection between your USB drive and your Mac.

If the USB drive works fine in another port, the initial port may have an issue and might need professional repair.

2. Try a different cable

When using external disks that connect through a USB cable, the cable itself may be the culprit. A damaged or incompatible cable can prevent data from transferring and cause the USB drive not to be recognized.

Try using a different cable, ideally a high-quality or Apple-certified one. Connect the USB drive with the new cable and observe if macOS Sequoia recognizes it.

3. Reboot your Mac

Restarting your Mac refreshes system preferences and can resolve minor software glitches, including issues with flash drives not being recognized.

  1. Click on the Apple menu in the upper-left corner of your screen.
  2. Select Restart from the dropdown menu.
  3. Confirm when prompted.
reboot macos from apple menu bar

Wait for your Mac to restart. Then, reconnect your flash drive to check if macOS Sequoia now detects it.

4. Plug the flash drive on another computer

If your USB drive isn’t recognized on macOS Sequoia, try connecting it to a different computer.

Testing it on another Mac or even a Windows PC can help determine if the issue is specific to your macOS Sequoia device or if the flash drive itself is faulty.

If the USB flash drive works on another device, the problem likely lies with macOS Sequoia’s system settings or USB port compatibility.

If it doesn’t work on any Mac or PC, there might be an issue with the USB drive.

This simple test can save you time and help you decide if further troubleshooting is necessary on your Mac or if the flash drive may need repair or replacement.

5. Check for software updates

Outdated software can cause compatibility issues with USB devices on macOS Sequoia.

Keeping your Mac updated ensures that you have the latest bug fixes and performance improvements for recognizing USB devices.

  1. Open System Settings from the Apple menu.
  2. Go to Software Update and allow your Mac to check for updates.
  3. If updates are available, click Update Now and follow the on-screen prompts.
macos sequoia update in macos software update window

6. Verify the USB drive in Disk Utility

If macOS Sequoia detects the USB device but does not automatically mount it, you can use Disk Utility to force a manual mount.

  1. Open Disk Utility by going to Applications > Utilities > Disk Utility.
  2. Locate your USB flash drive in the sidebar. If it appears but is greyed out, it means it’s not mounted.
  3. Select the USB device and click Mount in the toolbar.
mount flash drive from disk utility

If Disk Utility cannot mount the drive, the issue may be more complex, and the drive could require reformatting or repair.

7. Reformat the USB drive

If macOS Sequoia cannot read the flash drive due to an unsupported file system, reformatting the drive in a compatible format can resolve the issue.

Important: Reformatting erases all data on the drive.

  1. Open Disk Utility and select the USB drive from the sidebar.
  2. Click Erase in the toolbar
  3. Choose a format compatible with macOS like APFS or Mac OS Extended (Journaled), and rename the drive.
  4. Click Erase again to confirm.
  5. Once complete, reconnect the USB drive.
erase flash drive disk utility confirmation dialog

8. Mount the USB drive in Terminal

For situations where Disk Utility cannot mount your USB drive, Terminal can provide a more direct approach.

  1. Open Terminal from Applications > Utilities.
  2. Type diskutil list and press Enter. This command will display all connected disks, including identifiers like disk2 for your USB drive.
  3. Once you identify the correct disk (e.g., disk2), type diskutil mount disk2 (replace disk2 with your specific identifier) and press Enter.
diskutil command in terminal to mount flash drive

Using Terminal to mount the drive manually can sometimes help macOS Sequoia recognize drives that were otherwise inaccessible.

9. Test with a power supply

Larger external drives often require more power than a Mac USB port alone can provide. Connecting your drive to a powered USB hub can stabilize the connection.

Plug the powered dock or hub to your Mac and observe whether the drive appears. This can determine if the external drive needs additional power to operate correctly.

10. Modify Finder settings

Sometimes, macOS Sequoia doesn’t show external hard drives simply because the Finder app isn’t set up to display them.

A quick settings adjustment in Finder can make your USB drive visible on your Mac desktop or Finder sidebar.

Here’s how to check and fix it:

  1. Click Finder in the top-left corner of your screen and select Settings from the dropdown menu.
finder settings menu bar
  1. In the General tab of Finder Preferences, check the box next to External disks to make your USB device visible on the desktop.
show external devices in finder settings
  1. Switch to the Sidebar tab in Finder Preferences. Under Locations, ensure External disks is checked here as well, so it appears in the Finder sidebar.
show external disks in finder sidebar

Once you’ve adjusted these settings, reconnect your USB drive to see if it now appears on the desktop or in Finder. This small change can often solve visibility issues with external drives on macOS Sequoia.

11. Boot your Mac in Safe Mode

Safe Mode turns off non-essential services, which can help identify software conflicts affecting USB device recognition.

  • For Apple Silicon Macs: Shut down your Mac. Hold the Power button until the startup options appear, select your startup disk, then hold Shift and click Continue in Safe Mode.
  • For Intel-based Macs: Shut down your Mac. Restart while holding the Shift key until the login screen appears.

Once in Safe Mode, reconnect your USB flash drive and check if it appears.

12. Reset NVRAM

Resetting NVRAM can resolve settings issues that might prevent external USB devices from being recognized on a Mac.

  1. Shut down your Mac.
  2. Turn it on and immediately press Option + Command + P + R.
  3. Hold the keys for 20 seconds, then release them once the startup chime sounds.
command + option + p + r keyboard

Resetting NVRAM clears saved settings, which may help your Mac detect the USB device.

If you’ve tried all the above fixes and your USB drive is still not recognized, give your Mac some time—sometimes, it performs background tasks that can affect connectivity.

Additionally, if none of these steps work, it could be worth contacting Apple Support, as there may be a deeper issue with your USB device or macOS Sequoia.

USB keyboard or mouse not working on macOS Sequoia?

If your USB keyboard or mouse isn’t working after upgrading to macOS Sequoia, there could be a few reasons for the issue:

  1. Faulty keyboard or mouse: Try connecting a different USB keyboard or mouse to see if the problem persists.
  2. Problem with the USB cable: If the device is removable or has a replaceable cable, try a different one.
  3. Faulty USB port: Connect the device to a different USB port on your Mac to determine if the original port is defective.

If the device is connected via a USB hub, try plugging it directly into your Mac instead.

Testing with another USB drive can help identify if the issue is with the USB port or the peripheral itself.

If none of these steps resolve the issue, restarting your Mac or checking for the latest system updates may help.

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Ivelin is a Mac security expert who works hard to keep computers safe. He helps develop SpyHunter for Mac, a tool that fights off new cyber threats. With a lot of experience, Ivelin knows a lot about keeping Macs safe and makes sure people can use their computers without worry.

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