- Mar 05, 2021
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External hard drive can be a great supply if you don’t have enough space on Mac. However, it can also be bothersome if you can’t see external HD on Mac. This post will show you how to deal with this situation and hope it can help you to some extent.
Check if the file system of the external HDD is recognisable: The reasons behind for not showing up. Sometimes, the external hard drive is not showing up because your Mac is not set to. If you can't see the external hard drive on Mac, you can get Finder to locate the external hard drive. To make external HDD show up on the desktop and in the Finder of macOS Catalina, Mojave, or earlier, you could refer to the below operations.
How to Troubleshoot External Hard Drive Not Showing Up on Mac
External hard drive can be a great supply if you don’t have enough space on Mac. However, it can also be bothersome if you can’t see external HD on Mac. This post will show you how to deal with this situation and hope it can help you to some extent.
Solutions to make external hard drive show on Mac
Check the connection
It’s always a good idea to check the connection between your external HD and the Mac. Plus, desktop hard disks usually require external charges. Therefore, before diving into something deeper, here’s what you can do:
- For Desktop external hard drives, let’s say, Seagate Backup plus and WD Elements Desktop, make sure the external hard drive is externally connected to a power socket.
- For portable USB external hard drives, make sure the USB port is not wobbly, dusty, or loose. You can try another USB port if the USB port doesn't work due to physical damage. Also, make sure the connection is tight.
Boot the Mac into Safe mode
It’s possible that some incompatible applications prevent your disk from loading. To confirm this, you can boot your Mac into Safe mode for check. Follow these steps:
Step 1: Restart your Mac (some Mac computers play a startup chime).
Step 2: Immediately press and hold the Shift key, then release the Shift key when you see the loading bar.
Step 3: After rebooting the Mac, reconnect your external hard drive to the Mac and see if it is recognized. If the external hard drive is recognized by macOS in Safe mode, that means some suspicious programs stop your external HD from working.
To find out which program is responsible for the trouble, you can boot into Verbose Mode, and then uninstall the troublemaker.
Check the computer setting
If you have changed the computer setting by accident, chances are the Mac won’t show detected devices. To fix that, you can do the following:
- Show the external hard drive on the desktop: Go to Finder > Preferences > General tab and tick the box in front of External disks.
- Show external hard drives in Finder: Go to Finder > Preferences > Sidebar and make sure the External disks under Locations is ticked. Then your external hard drive will appear in Finder.
Access to the external HDD by /Volumes/ Folder
If the computer setting is modified, still, you can’t see your external HD on Mac. You can try your luck by accessing to it by /Volumes/ Folder. How to do that?
- Step 1: Launch Finder and click Go in the top menu bar > Go to folder.
- Step 2: Type /Volumes/ and hit Enter.
- Step 3: You can see the folder that lists all mounted drives and disk images. If your external hard drive is listed, you are free to access the hard drive.
Mount the external HD manually
By default, the Mac will mount detected disks automatically. However, if the disk is displayed in Disk Utility but you can’t see or open it, you can mount it manually to make it work. Here’s how:
- Go to Launchpad> Other> Disk Utility.
- Expand the View option and choose Show All Devices.
- Find and select the external hard drive that is not showing up on your Mac.
- Choose Mount at the top menu bar.
Repair the corrupted file system
One possible cause for external HD not showing up on Mac is that its file system is misbehaving. You can repair the corrupted file system with Apple’s built-in program, First Aid. Here’s how:
- Launch Disk Utility.
- Choose the grayed out external hard drive from the left sidebar.
- Click First Aid button on the top and then choose Run to confirm this operation.
Once it’s repaired, are you able to use it normally?
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Your Mac not recognizing an external hard drive can be cause for panic. But try to remain calm — it’s unlikely that anything has happened to your files. All of your data will still be on the hard drive, it just that, for whatever reason, you can’t access it.
Just so that you worry not about losing data, get Disk Drill. Available via Setapp, the app is the best tool that will rescue your files.
Download Disk Drill FreeFortunately, there are ways and means of getting the hard drive back up and running. Let’s get into some of them right now.
Why a flash drive is not showing up on Mac?
If you’ve plugged in a flash drive or USB drive and it’s not showing up on your Mac at all, it could be down to a faulty cable or USB port.
Before you try any system troubleshooting tips, start with the basics.
- Check that the drive is probably plugged in.
- Check the USB connector — does it look damaged or misshapen in any way?
- Check the cable — is it frayed or are there any wires exposed?
- If the external hard drive is plugged into a wall outlet, try a different outlet.
- Try a different USB cable — even cables with no visible defects can fail.
- Try connecting the hard drive to a different USB port — it could be a hardware issue.
- Try the drive in another Mac — if it works there, the problem is with the USB ports on your Mac.
- Test the hard drive on a PC — it could be formatted for PCs and not readable on Macs.
- Reboot your Mac — a simple on and off is sometimes all it takes.
- Reboot USB drives by shutting down your system and restarting it, holding Command+Option+P+R as you do. When you hear a sound and see the screen flash, release the keys and let your Mac boot up as usual.
If you’ve carried out visually inspections, tested your hard drive with different cables and power outlets, and tried different systems with no luck, it’s time to put your Mac to work.
1. Change the Finder settings
One of the most common reasons for Mac not recognizing external hard drives is due to the system not being set up to display hard drives on the desktop. There’s a simple fix for this:
Usb Not Showing Up Mac
- Open a Finder window.
- Go to Preferences > General.
- Check that the External disks option is enabled.
If your Mac is not recognizing a USB or external hard drive after this, you’ll have to try mounting it manually.
2. Mount an external hard drive on Mac
If Mac isn’t automatically recognizing your external hard drive, it’s time to force it to. Connect your hard drive and follow these instructions:
- Go to System Preferences > Disk Utility.
- Check that the external disk is listed in the left sidebar.
- Highlight your hard drive and select Mount. It should now appear under devices in the Finder.
If the hard drive still isn’t playing ball, the next step is First Aid.
3. Run First Aid on an external hard drive
Mac’s built-in First Aid tool is designed to verify and repair a range of issues related to corrupted files and apps, startup issues, and, crucially, external hard drive problems.
If your issue has to do with wanting to know how to open a flash drive on Mac that’s displaying but not allowing you access to files, First Aid might be able to help.
- Go to System Preferences > Disk Utility.
- Highlight your external hard drive and click on First Aid.
- Select Run to start running diagnostics and prompt Mac to automatically fix any issues.
If First Aid is successful in repairing any faults, your hard drive should be available to mount. If not, you’ll need to try the next option.
4. Delete potentially conflicting apps
External Hard Drive Not Showing Up Mac
How recent is the problem? If a flash drive not showing up on Mac was completely fine a few days earlier there could be an app causing conflict. If you’ve downloaded any new apps recently, uninstall them one at a time, connecting your hard drive after each uninstallation to see if the issue is resolved.
You can delete apps using the Launchpad or by dragging them to the Trash, but neither method is recommended in this situation. You see, while an app might appear to be deleted, associated files will be left on your system — files that could be preventing access to your external hard drive.
Instead, let CleanMyMac X take care of it. CleanMyMac X has an Uninstaller tool that can define your installed applications and associated files and remove every trace of an unwanted app.
And it couldn’t be easier to use.
- Download CleanMyMac X (for free).
- Launch the app and select Uninstaller.
- Click on View All Applications and select a recently installed app.
- Click Uninstall.
If you’ve worked through all recently installed apps and are still no further forward, your hard drive may have crashed or, worse, be completely broken. In this case, you’ll need a heavy duty tool like Disk Drill to rescue files.
5. Repair disk permissions
Mac External Drive Not Showing
Disk permissions keeps your files secure. Every file and folder has an associated set of permissions. Unfortunately, these can get messed up without you realising it, which can cause serious problems. You can fix these two ways. Either manually, as we mention in this article, or using CleanMyMac X, which is far easier.
All you need to do is:
- Click on Maintenance from the left sidebar menu.
- Check the box next to Repair Disk Permissions.
- Click Run.
The program will scan and fix any it finds that are broken or faulty. Your Mac should be running as good as new.
To prevent an external hard drive not showing up on Mac turning into an all-out disaster, always backup files on your system hard drive and in the cloud. Anytime you use an external drive, unmount the disk properly and store it safely. And finally, use CleanMyMac to uninstall apps and run regular Maintenance on your system to prevent applications conflicting with hard drive performance.