How to Fix "External Hard Drive Keeps Disconnecting on Mac"

External Hard Drive Keeps Disconnecting on Mac? All Fixes

Here I have some experimented solutions for the most common error "the disk you inserted was not readable by this computer". You can quickly resolve your external drive disconnecting error through following steps on Mac.

Wondershare Recoverit Authors

Sep 28, 2020 • Filed to: Solve Mac Problems • Proven solutions


Nowadays, several people who are using the external hard drive, having trouble while connecting them with Mac. Even a few days ago, I got the same issue while attaching an external hard drive with my mac book pro, such as "the disk you inserted was not readable by this computer."

The disk you inserted was not readable by this computer

Before discussing the solutions, I would like to put some light on why is this problem occurring?

Why does my external hard drive keep disconnecting?

If you connected your external hard drive with your Mac, and it's not responding like discussed above, definitely there is a kind of particular problem behind the scene, that you didn't recognize yet. I evaluated some possible cusses that are going to mention below.

Whenever these kinds of problems occur, your external hard drive doesn't show on your Mac. It is incredibly annoying when you are transferring data between two devices. Furthermore, the risk of data corruption can be increase while transferring data from the external drive to Mac.

For preventing this kind of risk and problems, There is numerous website which are providing not-effective methods. Still, I have some experimented solutions that work for such type of problem.

Solution 1: Make sure your Mac distinguish the external hard drive

This kind of approach makes you able to check whether your mac port or hard drive is physically damaged. If your mac book/ pc port or external drive is damaged, your Mac will not identify the external hard drive. And you will get the same dialogue on-screen as I showed above. You must have to check the Mac to recognize the external hard drive through the following steps:

Step 1: Click on the apple icon on the upper-left corner of your screen.

Step 2: Click on About this Mac.

Select About this Mac

Step 3: Click on the Overview button, and after that, select the system Report option. Through this action, a screen will appear, system information window.

Select the system report after a click on the overview button

Step 4: After displaying the system information window, double-click on the hardware option to expand the system information category.

Step 5: Select the storage if the hard drive you inserted is displaying in the right of the panel, which means there is no issue with your Mac's port or connected hard drive, so you just need to move on the following method. If it didn't display in the right panel, that means there is a problem with your Mac's port or drive for considering this issue; you can do the following things:

Click on storage to check the external hard drive information

Attach the external hard drive to a different computer to check whether it is working or not. If it is not working or displaying on another computer, then your external hard drive has a software or hardware problem. The only option to resolve this problem is to replace your external hard drive with a new one.

Use a new hard drive on your Mac's USB port to check whether the device is working on it or not. If it does not work, there is a severe problem with your Mac hardware. Try another available port of your Mac, or take it to repair workshop for further inspection.

Solution 2. Resolve this issue by using Disk Utility

Sometimes, this kind of problem can because of missing of the disk partition table. You can even utilize the Disk utility function, which is a built-in Mac to repair your external hard drive. It is advantageous to fix numerous hard drive problems such as external hard drives to keep disconnecting issues on your computer or laptop.

Here is instruction, how you can repair your external hard drive by using Disk utility.

Step 1: Click on the initialize button when the error message dialogue appears. After that Disk utility window will open.

Click on initialize for repair drive with disk utility

Step 2: Click on the view option in the menu bar, and choose Show all devices.

Click on view in the top menu bar and select Show all devices

Step 3: the left pane of the display screen, click on the external device. After that, click on the First Aid tab option.

Select the external device and then click on the first-aid function of disk utility

Step 4: Click on the Repair Disk in the in the bottom window for a start repairing process.

Click on repair button for start repair process

Step 5: This step will take several minutes for processing. After done repairing. Check back your external hard drive with connecting it again.

Solution 3.Change finder settings in your Mac

There is one of the most common methods that people usually use to resolve external drive issues. Change the finder settings make your external drive recognize on your Mac. It is also a well-knowing cause that makes your mac system unable to understand the external devices. For fixing this issue, you need to follow some instructions to resolve it by changing the finder settings.

Step 1: First, open your Finder window in your Mac. Go to the finder preference.

Step 2: When finder preference got open, now click on general settings option.

Step 3: In the last phase, you must have to assure that the external disk option enabled or not. If it is allowed, then the process got to end here, but if it does not, then make it let instantly and save all the changes.

Solution 4. Recover or backup your drive data before format

Sometimes, corrupted files can be a significant cause of such type of error on your Mac. File corruption can cause by a malicious virus, improper shut down your Mac, or forceful restart. To resolve such kind of issue, you need to recover your data first and, after that, perform hard drive format. But the question is rising on this point that how can we repair and recover our corrupted, lost data.

For dealing with this problem, you will need to contact third party software because Mac does not have such features to make it recover your drive data. If you are still sticking with; what kind of software you need to recover your data, I will recommend you Recoverit software.

Recoverit data recovery software makes you able to recover more than 1000 formats of files from a variety of modern storage devices and operating system such as Mac OS, MS Windows( all version), digital cam, USB drive, Drone cam, SSD drive, CF or SD card, etc.

Furthermore, you can repair and recover the various type of files like video, audio, photos, documents, emails, and many others.

Recoverit will take several seconds to initiate on your Mac to start itself when it got launched. Now you are three steps far from your lost data.

Step 1: Select your device

First, make it launch Recoverit data recovery software on your Mac.

To recover your specific data from your external hard drive, you need to select the partition or hard drive by clicking on your external hard drive. And then click on the "Start" button to initiate the recovery process.

Select a location to start the recovery

Step 2: Scan the location

On this step, Recoverit software will start scanning your files all around the drive. Using an advancing search algorithm will find out all your lost, corrupted, encrypted, deleted, or formatted data.

During the scan, if you get your specific data, then you can pause scanning at the spot.

Scanning lost file from the external drive

Step 3: Preview and Recover Files

Recoverit software allows you to preview all the recoverable data or files before recovering them. You can simply select all targeted files such as video, audio, documents, etc. manually by clicking on the "Select" option to recover all those files chosen by click on the Recover button. After click on it, you will retrieve all your recoverable selected data will back.

Preview scanned photo from external hard drive

Furthermore, it will recommend you to save it on another location rather than original locate to prevent overwriting data.

Solution 5. Change the format of your external hard drive

This type of issue usually occurs due to the external hard drive's format, especially if it is NTFS. Mac does not support NTFS format officially. If your external hard drive is NTFS formatted, it might be readable for you but not writeable. And it might be possible that you get such type of external drive disability error usually occurs when you insert your external hard drive in Mac. You can fix this problem by, change the format of your external hard drive from NTFS to exFAT, that supported by both Windows and OS X.

Note: Keep in mind that changing the format of your external hard drive can erase all the data permanently. You must have to make a backup of all data of your external drive. For doing this, you will need a windows computer who can easily support NTFS format to save you all data in it.

For ensuring the drive format, follow some steps:

Step 1: Click on the search option in the upper right corner of your mac screen. After then, a spotlight search window will appear

Click on search option for open disk utility

Step 2: Type the Disk utility in your keyboards and press enter. Disk Utility window will open.

Type disk utility on your keyboard and enter

Step 3: Select your external disk drive and then select on the info tab of Disk Utility function.

Select drive for check information of drive format

Step 4: Check whether the file system is exFAT or NTFS. If NTFS, then follow some steps below to change its format.

There are four steps you will follow to change the format of your external drive from NTFS to exFAT.

Step 1: Open Disk Utility.

Step 2: Again, select the disk drive from the sidebar and click on the erase option.

Select the disk from the sidebar and click on erase option in disk utility

Step 3: Choose the format EXFAT and click on the Erase button. This process will take several seconds to format all your drive data. You need to be patient for this procedure completes.

Erasing disk will destroy all the data stored on it

Step 4: Now, you can check if your Mac can read external hard disk drive.

If the concerning problem persists, then try the next following method.

Solution 6. Fix error with terminal

if your external hard drive is disconnecting you on Mac, you can even check and resolve this error through USB and with the terminal. For solving this issue, you need a few steps to follow that discuss below:

Step 1: The very first, you need to open Terminal application in utilities, then type:

Open terminal in utilities and type diskutil list  press return

Step 2: And then you will find the number of your external hard drive or USB by type: diskutil info disk2 and press return.

Find the external hard drive by type diskutil info disk2

Important: Here, you need to replace 2 with your external disk number.

Step 3: And now you will type: diskutil eject disk2 and press return.

Step 4: Type the diskutil list on the keyboard and press return. When the USB drive gets disappear in the Terminal list, you will close the window instantly.

Step 5: You will simply shut down your mac Terminal application and then open the console to evaluate the drive errors.

Step 6: At last just, click on "Faults and Error" to make sure whether there is still any problem or not.

Identify error by clicking on Error and Faults

Performs all the steps we discussed above; you will plug in your external drive in Mac again. If the error shows again after reconnecting the external hard drive, then it is pretty sure that your external drive is entirely secure. So, now you can connect it with another mac to ensure its visibility.

Essential Suggestions to Reconnect External Hard Drive

1. The right way to connect External Hard Drive on Mac

Usually, when you connect external hard drive on mac port quickly, it ruins the external hard drive cable and sometimes ports also and make it disabled on your Mac. That is why whenever you connect your external hard drive on Mac, you should do it in a very decent way so that the usability age of cable and port might extend, and also your Mac will be able to recognize it frequently.

2. Right Way to Prevent External Hard Drive Disconnecting Randomly

Simply just click on the finder, at the left bottom of the screen. Click on the eject external icon by selecting your external hard drive name.

Eject hard drive on Mac

3. Right Ways to Prevent External Hard Drive Lost on Mac


In final words, I hope you got to fix your mac error "the disk you inserted was not readable by a computer." There are several other ways to resolves this issue, but recommend methods are highly workable. If you are still having this issue, you can feel free to comment below. We will love to help you to resolve this issue with multiple solutions.

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