My WD external hard drive will not mount and does not show up anywhere. I also can't go back to an older OS because my backup is on my external HD. All my files are on external HD so iTunes is useless and everything else. I hope they fix this soon. This vid helps Fix External Hard Drive Not Showing Up problem on your Mac computer. I got a problem with my Seagate external hard drive not showing up on my MacBook Pro. My external hard drive is a Seagate backup plus 1TB. I have turned my computer on and off and unplugged the external hard drive. This has been an issue on my MacBook Pro for a while and I’m getting frustrated now.
Before you begin
You can resolve many display issues by updating the software on your Apple devices, cables, and adapters. If you can see an image on your screen, check for software updates using the Mac App Store:
If you're using a display, hub, extender, or adapter not made by Apple, check with the manufacturer for any updates that might be available.
If you're trying to connect a 4K display or Ultra HD TV with your Mac, make sure your computer meets the requirements for using these external displays.
If your software and firmware are up to date, or if you can't see the image on your screen, try the steps below for your specific issue.
If the display image is blank or unusable
Try these steps if you don't see an image on your display. These steps can also help if the image on your screen repeatedly turns on and off (flickers), if horizontal lines appear (snow), or if the image is distorted (torn or scrambled).
These steps likely won't help if the issue is only happening in one app. If you see similar issues in only one window or app, check with the app's developer for updates or more help.
Check connections
Check the connections to your Mac and external displays:
Detect your display
If you're using an external display, sleep and wake your Mac to make it check for connected displays:
If you're using more than one display, and you can see the image on one of the displays, you can also use Displays preferences to check for connected displays.
Adjust video settings
If there's no image on your display, try adjusting your display's brightness or contrast. If there's still no image, or the image appears torn or scrambled, try selecting a different video resolution in System Preferences.
Adjust brightness
Change your display resolution
If you can't change the resolution of your display because you can't see an image, restart your Mac in safe mode to reset the display resolution to defaults.
If starting in safe mode doesn't resolve the issue, reset your Mac's NVRAM and SMC to reset the video ports on your Mac to their defaults.
Check for third-party display software![]()
If your display works only when your Mac is started in safe mode, and you have display-related software installed, check with the software's developer for updates, or try temporarily uninstalling it.
If an image appears fuzzy or blurry
If images or text on your display appear pixelated or blurry, check these things.
Check your display resolution![]()
Make sure your display resolution in System Preferences is set to its default. If you're using a resolution that's scaled, the image might be magnified to fit the display. This can cause the image to look blurry in some apps.
If you use a monitor or an HDTV connected with an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your display for a 'monitor mode' setting to get the best video quality.
Retina displays
If an app you're using appears low resolution on your Retina display, check to see if an update to the app is available. Most apps have been updated to use the higher pixel densities of Retina displays.
Lower-resolution images on some web pages might also appear 'softer' when viewed on a Retina display. This is because Retina displays have a higher pixel density and not all websites use Retina-ready images.
For example, the images below look different when viewed on a Retina display, but the same on a non-Retina display. This happens because the Retina-ready image has a higher pixel density:
If you see contrast or color issues
If your entire display image seems too dark or too bright, you can adjust the brightness and contrast from the Displays pane of System Preferences, or by using your display's built-in controls.
Adjust brightness and contrast
To adjust the brightness of your Apple display, press the brightness key or F2 key on your keyboard. You can also use the brightness adjustment for each connected display in System Preferences > Displays.
Displays not made by Apple sometimes have brightness and color adjustments built into the display. Check the documentation for your display to see if it includes built-in controls.
When you connect a display, projector, or HDTV using an HDMI cable, you might see a difference in video quality if your display is set to television mode. Check your device for a 'monitor mode' setting to achieve the best video quality.
You can also calibrate each display from the Color tab of Displays preferences to get the best color and brightness from your display.
If you see bright or dark pixels
If individual pixels on your display seem too bright or too dark, see these articles for more help:
Connecting displays with Thunderbolt 3 (USB-C)
The Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter connects Mac models with Thunderbolt 3 (USB-C) ports to older devices that use Thunderbolt (10Gbps) or Thunderbolt 2 (20Gbps). For example, this is the adapter that you should use to connect your MacBook Pro to an Apple Thunderbolt Display or a third-party Thunderbolt 2 storage device.
This adapter doesn't support connections to Mini DisplayPort displays, including the following Apple adapters and displays:
If you're using the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter to connect to a compatible display and the display doesn't show an image, try unplugging the adapter and plugging it back in.
Get more help
If you've tried these steps and your display still isn't working, contact Apple Support to get more help.
Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
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 Free
Fortunately, 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.
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:
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:
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.
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
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.
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 permissionsComputer Not Recognizing External Drive
Disk permissions keeps your files secure. Every file and folder has an associated set of permissions. Hitfilm 3d models download. 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:
Mac Pro Not Recognizing External Hard Drive
Windows Not Recognizing External Hard Drive
The program will scan and fix any it finds that are broken or faulty. Your Mac should be running as good as new.
Mac Pro Not Recognizing External Hard Drives
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.
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