- Key Takeaways:
- ① Most people mistake a drive that's not showing up on the desktop as a drive not being recognized by a Mac. But in reality, it could be because the drive is not mounted, not set to appear in Finder or the desktop, or does not have enough power to connect.
- ② To figure out which situation you're in, check if the drive shows up in Finder, Disk Utility, and System Information. As long as System Information lists it under the "USB" section, it's detected by your Mac.
- ③ If your external drive is not showing up in System Information, it means macOS is not detecting the device at the hardware level at all. This is the most serious "not recognized" state, and it usually points to a physical or connection-related problem, not a software issue. In this case, try different ports, cables, or adapters.
- ④ Stop troubleshooting if your drive won't appear in System Information after checking connections.
- ⑤ If your external drive shows up in Disk Utility but not in Finder, check Finder settings, ensure file system compatibility, run First Aid, or reformat the drive.
When an external drive stops showing up on the desktop, many users assume it's not recognized by the Mac and grow worried about the worst-case scenario: that the drive has been physically damaged and all data is gone. However, the issue is often less severe than it seems.
It could be caused by something as simple as a loose connection, a corrupted or incompatible file system, settings, or power issues. A drive not showing up does not automatically mean hardware failure or permanent data loss.
Instead of rushing into fixes like formatting or repairing, this guide will walk you through the process to identify the drive issue and apply the most effective solutions to resolve it.
Decide your situation in 30 seconds
Q1: Can you see the drive in System Information?
The System Information app provides detailed specifications and other information about your Mac. In some versions of OS X, this app is called Mac System Profiler. So, if the connections are good, you can check whether the connected external drive is detected in System Information or not.
- Choose the Apple menu > About This Mac.
- Click the System Report button to see more details provided by the System Information.
- Find and click the USB option under the Hardware section.
- Check if the external drive is recognized here or not.
If the external hard drive doesn't appear in System Information, it's not recognized by your Mac, possibly due to insufficient power supply, a bad USB port or cable, or hardware damage.
If the external hard drive appears in System Information, it's detected by your Mac at least at the hardware level. Also, compare the value between Current Available and Current Required.
If Current Available > Current Required, your drive has enough power.
If Current Available < Current Required, your drive doesn't have enough power to appear in Disk Utility.
Q2: Can you see the drive in Disk Utility?
Press Command + Space and type in "disk utility" to open the built-in macOS disk manager. Check if your external hard drive shows up on the left.
If the external hard drive appears in Disk Utility but is grayed out, it's detected but not mounted on your Mac. The disk issue is due to an incompatible file system, drive encryption, or disk corruption.
If the external hard drive appears in Disk Utility normally, it's detected and mounted on your Mac properly. The disk issue is most likely caused by Finder not being set to display external drives on the desktop or Finder sidebar.
If the external hard drive doesn't appear in Disk Utility, it likely has a failed enclosure or bridge chip.
Q3: Can you see the drive in Finder?
If the external hard drive appears in both System Information and Disk Utility as a mounted drive, but it's not listed in Finder's sidebar, it's not configured to show up in Finder.
What does "Mac doesn't recognize an external hard drive" actually mean?
When people state that their Mac doesn't recognize an external hard drive, they usually mean one of the following four scenarios. Understanding which scenarios you are in is the key to choosing the right fix while avoiding data loss.
- The drive doesn't appear in System Information.
- The drive appears in System Information, but not in Disk Utility.
- The drive appears in Disk Utility, but cannot be mounted.
- The driveappears in System Information and Disk Utility, but it does not appear in Finder.
How macOS detects an external drive
If you find your Seagate, WD My Passport, Toshiba, or any external hard drive not detected by Mac, your Mac may have failed to recognize the drive.
To understand the reasons for Intel & M1 Mac not recognizing external hard drives, we need to take a closer look at how macOS recognizes an external hard drive.
Step 1: The external hard drive is connected to your Mac.
Plugging the external drive into a computer will establish the hardware connection, which will supply the drive with sufficient power and data transfer capability. Visually, you can see the external hard drive lighting on and hear it spinning.
If this step fails, you won't see the light on or hear any spinning sound.
Step 2: macOS detects the external hard drive.
After the connection, the Mac would detect that a new storage device was plugged in. It's going to tell the device's type and manufacturer information, which will help macOS know how to load and read this drive.
If this step fails, the drive is not recognized and won't show up in System Information.
Step 3: macOS reads the external hard drive.
After recognizing the hardware information of the drive, the Mac will call other system components to read the external hard drive's type and partition information. If the drive is readable by the Mac, a visible disk icon would be formed as a consequence.
If this step fails, your drive either won't appear in Disk Utility or appear to be unmounted in Disk Utility.
Step 4: macOS recognizes the files in the external hard drive.
Once Mac successfully reads the partition information of the drive, it will go further by calling related programs to recognize the file system of each partition on the drive. A recognized file system will let macOS know how and where your data is stored on the external hard drive so that it can mount the external hard drive for use.
If this step fails, your drive won't mount and will appear grayed out in Disk Utility.
Step 5: Mac shows the external hard drive to users.
Going so far, macOS has recognized the external hard drive. Meanwhile, other programs get notified that there is a new volume available. But to make it convenient for users to access all the data stored on the drive, it will check the system preferences and decide if users want to automatically mount and show the external hard disk on the desktop and in the Finder.
If this step fails, your drive will appear in Disk Utility as mounted but won't show up on the desktop or in Finder's sidebar.
Therefore, some of the common causes that may render a MacBook unable to recognize external hard drives are:
- The external drive isn't properly connected for data transfer and power supply.
- The drive is connected to a Mac with a faulty cable.
- Your Mac isn't set to display external drives on the Finder and desktop.
- Certain macOS 12 bugs result in the MacBook not recognizing external hard drives.
- Mac can't read and recognize the partition information of this hard drive.
- Mac can't recognize the file system of the drive successfully.
- Repeated force ejections corrupt the external hard drive.
Now, let's check them one by one to fix MacBook not detecting external hard drives.
If your external hard drive is NTFS-formatted, keep reading: NTFS External Hard Drives Not Mounting/Working on Mac (Sonoma/Ventura)
External drive doesn't appear in System Information
If your external hard drive cannot be seen in System Information, it's not recognized by your Mac.
It turns out that most of the time, Mac doesn't recognize external drives, USB flash drives, pen drives, SD cards, etc., just because the drive is not receiving enough power due to connection issues, such as faulty USB cables, USB-C hubs, or adapters—especially with bus-powered drives.
Many external 2.5-inch hard drives rely entirely on USB power. If it doesn't have sufficient power, the drive can't be recognized or mounted. Besides, Apple Silicon Macs (M1, M2, M3) are more sensitive to power fluctuations than older Intel Macs. If an external hard drive doesn't receive stable power, macOS may refuse to list it.
To ensure a stable, sufficient power supply, you should:
- Plug the external drive directly into your Mac and avoid using a hub that shares power among several devices.
- Try a different USB cable or port.
If your drive is still not detected in System Information, it likely has hardware issues that can't be resolved by yourself. Contact a local repair shop for assistance if it contains valuable data.
External drive appears in System Information but not in Disk Utility
If a drive shows up in System Information but not in Disk Utility, it means the Mac can see the hardware, but cannot interpret it as a usable storage device. In other words, the USB/Thunderbolt connection is working, but the storage layer has failed. This is usually due to a failed enclosure, controller, or severe disk-level issue.
In this case, you can try a different external enclosure or try the drive on a different computer.
External drive appears in Disk Utility but is not mounted
The most common case you may face when you can't see an external hard drive on a Mac is that the drive is not mounted, appearing grayed out in Disk Utility. Here are the solutions to fix it:
Mount NTFS File System
File system issues can also cause your MacBook to fail to recognize the external hard drive.
Open Disk Utility, and you can see if the file system is NTFS (for Windows PC) in the right column. If so, you can't mount the external hard drive in Disk Utility and can't access files on it. To mount the NTFS drive in read/write mode, use an NTFS for Mac software or reformat it as FAT32, exFAT, Mac OS Extended, or APFS (Apple File System).
If it is not formatted for a Windows PC but any other macOS-friendly file system, it's possibly because the external disk has been encrypted. If it's a WD external hard drive that is not recognized by Mac, you can check if it is encrypted by WD Security. If so, simply unlock it with WD Discovery and access the external drive again.
Repair corrupted external drive with First Aid
Here's how to fix the external hard drive with the First Aid tool in Disk Utility to make a corrupted or external drive detectable on Mac again:
- Click Launchpad, find the Other folder, and open it. Here, you can see and launch Disk Utility.
- Click the View option at the upper left, and then choose "Show All Devices".
- If you can see volumes of the external drive in the left sidebar, be it lighted or greyed, select the name of the unrecognized external drive.
- Click on the First Aid button in the top center of the Disk Utility window and click Run.
If you fail to repair an external hard drive by running Disk Utility First Aid, then the disk might be corrupted too seriously.
Reformat the external drive
The ultimate solution to the "disk not recognized on Mac" issue is to reformat the drive. It can solve almost all mounting issues, whether it's caused by an incompatible file system or drive corruption.
Please note that reformatting will wipe your data off the unrecognizable external drive. So, make sure you have a copy of the important documents before reformatting. If you don't have any backup in hand, you can also recover lost files from the external hard drive on Mac with the iBoysoft Data Recovery for Mac app.
Follow this guide to reformat the unrecognized external hard drive: How to Reformat External Hard Drives on Mac?
External hard drive mounted but not in Finder or the desktop
If Disk Utility shows your external hard drive as mounted, but it doesn't appear in Finder's sidebar or on the desktop, change Finder settings.
How to find an external hard drive on Mac:
- Go to Finder > Preferences > Sidebar from the top menu bar.
- Select External disks under Locations to list your external drives in the Finder sidebar.
- Shift to the General tab.
- Check External disks under "Show these items on the desktop". Then your connected drive will appear in Finder and on the desktop.
You should now find it showing up in Finder - next to the remote disk and your desktop.
When is data recovery actually necessary?
If you decide to reformat the external hard drive but don't want to lose the important documents on it, you can recover them with iBoysoft Data Recovery for Mac. It's capable of recovering videos, images, audio, documents, etc, from accessible external drives on Mac. Follow the steps below to recover data from the unrecognized external hard drive:
Warning: No data recovery tool can recover files from a drive that's not recognized in System Information.
Step 1: Free download, install, and open iBoysoft Data Recovery for Mac.
Step 2: Choose the external drive and click Search for Lost Data.
Step 3: Once the scan is complete, preview the found files.
Step 4: Select the files you want to recover and click the Recover button.
Step 5: Save the recovered files to your Mac or another external drive.
Read-world scenarios
External drive not recognized after a macOS upgrade
After upgrading macOS, an external drive that previously worked normally suddenly becomes undetectable or unmountable. This often results from incompatible drivers. macOS upgrades often update disk drivers, security policies, and filesystem handling. Older drivers, third-party kernel extensions, or outdated disk utilities may no longer be compatible after the update.
Solutions:
- 1. If the drive is NTFS-formatted, use a compatible NTFS for Mac driver. 2. Recover data from the drive and reformat it. 3. Downgrade macOS to the previous version.
USB hub causes insufficient power on M1 / Apple Silicon Macs
An external drive randomly disconnects, fails to mount, or is detected intermittently when connected through a USB hub. This issue happens because many USB hubs do not provide enough power for external hard drives or SSDs. Besides, Apple Silicon Macs are more sensitive to power fluctuations.
Solutions:
- 1. Connect the drive directly to the Mac. 2. Use a powered hub.
Also read:
FAQs about Mac not recognizing external hard drive
- Q1. How to access external hard drives on Mac?
-
A
Connect the drive to your Mac device via the USB port. After macOS detects the drive successfully and shows the device's type and manufacturer information, access the files in Finder after they're showing up on Mac.
- Q2. What do I do if my external hard drive is not detected?
-
A
If you find your external hard disk not detected in Mac, do the following:
1. Make sure the hard drive is supplied with enough power.
2. Try to re-plug the drive if Mac doesn't detect the external hard drive.
3. Try another USB port to connect the external drive.
4. Try to plug the external hard drive into the Mac's USB port slowly.
5. Try a different cable to connect the external hard drive.
6. Try another USB hub or USB-C adapter.
7. Reset system management controller.
- Q3. How do I force my Mac to mount an external hard drive?
-
A
First, make sure that your external drive is correctly connected to your Mac. Next, reboot the Mac computer and launch Mac Disk Utility, locate and select the unmounted drive. Finally, select Mount at the top menu.