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. 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.
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Fixing an external hard drive that’s not showing up on Mac
Subscribe Now. May 24, Updated: January 11, CleanMyMac X. Free Download. If the external hard drive is displayed in Disk Management, right-click it to display a pop-up window. Click Change Drive Letter and Paths.
- Check the state of the external hard drive in Disk Utility.
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This displays a box that allows you to change the drive letter for the device. Click Change. This allows you to change the drive letter. Select a new drive letter and click Ok. Use the drop-down menu next to "Assign the following drive letter" to select a new drive letter for the external hard drive.
USB External Troubleshooter | Seagate Support UK
Click Ok when you are finished. Changing the drive letter may force Windows to recognize the hard drive. Right-click any unallocated space. If there is any unallocated space on the hard drive, it needs to be initialized in order to be recognized by Windows. Click Initialize Disk. This opens a window that allows you to initialize the Disk.
Click Ok. This initializes the disk so that it is recognized by Windows. Format the drive. If the external hard drive was formatted on another computer platform, such as Mac or Linux, it may not be recognized by Windows. If all else fails, you can reformat the drive for Windows. If you plan on using it with other devices, select FAT32 as the file system. Warning: Formatting the external hard drive will permanently erase all the data on the external hard drive. Use this step as a last resort. If possible, try to backup any files you want to keep to another computer.
Use the following steps to format the hard drive. Right-click the external hard drive in Disk Management. Click Format. Type a name for the drive. Method 4.
- First of all: Do some basic checks.
- How to fix: External hard drive not showing up Mac Computer - MacTip!
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Open the Finder. Click Finder. It's in the menu bar at the top of the screen on the left next to the Apple icon. This displays a drop-down menu. Click Preferences…. It's the second option in the "Finder" menu. This displays the preferences menu. Click the General tab. It's the first icon at the top of the preferences menu. It has an icon that resembles a light switch.
Click the checkbox. Method 5. Reset the SMC. The way you reset the SMC is different depending on what type of Mac you have. Method 6. Click Applications. It's in the side bar to the left. This displays all the applications installed on your Mac. Click Utilities. It's the blue folder in the Applications.
Why is External Hard Drive Not Showing Up on My Computer?
This displays all the utility programs for your Mac. Click the external hard drive volume. It's listed below the drive name in the sidebar to the left. This displays how much of the external hard drive has been used. Click Mount if available. This button is at the top of the Disk Utility app.
This forces Mac OS to read the external hard drive. If the button says "Unmount", the external hard drive is already mounted. If the "Mount" button is grey out, Mac cannot read the disk. Click First Aid. If there is no volume for the external hard drive, or the mount button is greyed out, Mac cannot access the external hard drive.
Click "First Aid" at the top to scan the external hard drive for errors. Click Run. It's in the prompt that appears when you click "First Aid". This runs a scan of the external hard drive and attempts to fix any errors. Click Repair Disk. If First Aid finds errors on the external hard drive, it display a list of the errors and ask if you want to repair the external hard drive. Click Repair Disk to fix the errors on the external hard drive. If First Aid is unable to repair the external hard drive, it may be formatted in a file system that MacOS can't read, or it may be a faulty external hard drive.
Click Partition or Erase. If the external drive has be formatted using a file system that can't be read by MacOS, you could either partition the unused portion of the external hard drive, or erase the entire drive and reformat it in a file system that can be read by MacOS. If you plan on only using the the external hard drive, select Mac OS Extended as the file system. Warning: Erasing and reformatting your external hard drive will erase all the contents on your external hard drive. Use that as a last resort. If possible, try to back up the contents of the external hard drive to another computer before reformatting it.
Use the following steps to partition or erase your external hard drive: Partition: Click Partition in Disk Utility. Type a name for the partition next to "Name:. Select a format for the partition next to "Format:".