Solved: Hard Drive or External Device Not Showing Up on Mac

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Normally, when you connect an external hard drive or USB flash drive, memory card to your Mac's USB port, you soon see it mount on the desktop. Mac likes to ensure these are easy to find, so they also appear in the Finder in the left-hand column under Devices, since Mac's treat them the same way as another computer. You can open the external hard drive to find the files you want.

However, in some cases, the external hard drive or external device is not showing up on Mac when you have connected it to your Mac or you can't access to the data in the external hard drive, in this article, we will help you to solve issues like these:

• Can't find a volume on Mac.
• The external hard drive, USB flash drive, memory card is not showing up on Mac.
• My Mac can't recognize the external device.
• I can't open connected external device on my Mac.
• When I open the external device, there is no data in it, where is the data gone?
• The hard drive is read-only on Mac.
• External hard drive/USB flash drive/memory card can't mount on Mac.
• File system gets corrupted.
• The external device needs to be initialized.

Why Hard Drive or External Device Not Showing Up on Mac?

There are many reasons will result in external device, like external hard drive, USB flash drive not showing up on Mac, such as:

• Bad USB cable or Thunderbolt port.
• macOS or software update issue.
• Mac is infected by virus files or malware.
• Motherboard issue.
• The external hard drive/USB flash drive/memory card gets damaged.

Fix Hard Drive or External Device Not Showing Up on Mac

Solution 1. Check Finder Preferences.

If your external hard drive, USB flash drive, memory card is not showing up in Finder and Desktop, it's possible that the configuration of the Finder Preferences is stopping your external storage device showing up. In other words, you didn't allow the connected external hard drives showing up in the Finder or on the Desktop. Try the following to make sure your Mac is set to show mounted drives on the desktop.

1. Open Finder. Click on Finder in the menu at the top of your screen.

2. Choose Settings > General and make sure that there is a tick beside External Drives.

3. Go to Sidebar tab, tick External disks under Locations to show your external storage devices on Mac Finder.

Solution 2. Check your USB cable, Thunderbolt port or try another Mac/PC.

Just check your USB cable, Thunderbolt port. Test, change, restart your Mac, reconnect your device, etc. Or you also can try to connect the device to another Mac, PC to check if it can be recognized.

Solution 3. Check the external hard drive, USB flash drive, memory card on Disk Utility.

Open Disk Utility on your Mac, if the external storage device is showing up on the left sidebar of Disk Utility, just select it, then click on Mount to let the external storage device mount on your Mac.

If the drive cannot be mounted, you can try to fix the drive. Run First Aid by clicking on First Aid button - find logical errors on your external storage device and fix them.

If the methods above still do not work, just try to format the external hard drive, USB flash drive or memory card. Just choose the external storage device, and then click on Erase button.

Solution 4. Change the external hard drive/USB flash drive/memory card's file system.

In some cases, the file system on the external storage device gets corrupted - so your Mac can't recognize the it. Or the file system of the external storage device is incompatible with Mac OS, NTFS, for example. You can format the external storage device to resolve this problem. Here are three methods you can try to format your external storage device.

• Format your external storage device with Disk Utility.
• Format your external storage device on a Windows PC.
• Format your external storage device with third-party disk formatting software - such as Donemax Data Eraser for Mac.

Recover Data with Mac Data Recovery Software.

You may lose data due to fixing the unrecognized device or hard drive. Don't worry. Mac data recovery software, such as Donemax Data Recovery for Mac is able to help you securely and easily recover lost data even you have erased the hard drive with Disk Utility. Follow the steps below.

Step 1. Download and install Donemax Data Recovery for Mac.

Download and install Donemax Data Recovery for Mac. It is fully compatible with all OS X and macOS versions. Then open it on your computer.

Step 2. Select the hard drive where you lose your data.

Donemax Data Recovery for Mac will list all hard drives and external devices on your Mac. Just select the hard drive where you lose your data.

Step 3. Scan the hard drive to find lost data.

Donemax Data Recovery for Mac offers advanced data recovery technology, after clicking on Scan button, it will deeply scan the hard drive and find all lost data.

Step 4. Recover lost data.

After scanning, just select the wanted data and save it to a safe location.

Donemax Data Recovery for Mac will deeply scan the hard drive or device, then find all deleted/lost files and existing files on the hard drive/device. It means it also can help you export files from an inaccessible device or hard drive to your Mac.

Permanently Erase Data from A Drive on Mac

If you are going to sell your Mac or give an external hard drive to other people, you'd better permanently erase all your private data so that it can't be recovered by data recovery software. Just download the best Mac data erasure software - Donemax Data Eraser for Mac to help you wipe all data from a hard drive/device beyond the scope of data recovery. Now, follow the steps below to format and wipe a hard drive or external storage device on Mac.

Step 1. Download and install Donemax Data Eraser for Mac on your Mac. Open it.

Step 2. Choose data erasure mode - Erase Hard Drive. Select the hard drive or device you want to wipe.

Step 3. Click on the Erase Now button, there will be a popup appear. You can then select a data erasure standard from the list.

Step 4. To start the wiping process, just click on Continue button. The software will quickly and permanently erase all data in the hard drive or device.

Step 5. Once the process gets finished, all data on the hard drive or device is gone forever, can't be recovered by any data recovery software.

Donemax Data Eraser for Mac is one of the best data erasure software. Once your data is erased by this Mac data erasure software, the data will be gone forever, can't be recovered by any data recovery software. After erasure, you will get a brand new hard drive or device. You'd better make a backup of your data before wiping the hard drive or device.

Conclusion:

When handling a hard drive or external devices, like external disk, USB flash drive, or memory card, it's necessary to be careful and gentle. If the drive was dropped, not safely ejected before unplugging it, the drive would be damaged and cannot show up on Mac. Also, it's essential to check the disk health status regularly to ensure your data is safe on the drive.

If there are issues happened and the hard drive or external device is not showing up on Mac, don't be panic. You can first check the connection, restart the Mac to have a try. Otherwise, you can first use Mac data recovery software to recover the data. Then follow the other methods to fix or reformat the drive. Mostly, the issue could be fixed. If there are physical issues and cannot be fixed in any way, you may have to send it to a local data recovery center to retrieve the data in clean-room first. Also, you need to get a new drive for further use.