How to Recover Data from an Unmountable Drive on Mac: 6 Safe Methods

TL;DR:

When a Mac detects but cannot mount a drive, verify its visibility in Disk Utility's "Show All Devices" view and extract your files to a separate, healthy disk before running First Aid, changing partitions, or formatting.
    ● If the volume is visible but greyed out, attempt to Mount it in Disk Utility or use Wondershare Recoverit to extract supported files, ensuring you only run First Aid after securing your data since failed repairs can leave the volume permanently unavailable.
    ● Advanced users can attempt a manual mount using Terminal commands like diskutil mount diskXsY, but must carefully verify capacity identifiers to avoid executing destructive commands that cause further data loss.
    ● Stop all repeated connection tests, power cycles, and software scans and consult professional data recovery if the drive clicks, overheats, repeatedly disconnects, or remains absent after testing one known-good cable or direct port.

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If your Mac detects a hard drive but cannot mount or open it, recover important files before running First Aid, changing partitions, or formatting the drive. First check whether the physical disk appears in Disk Utility. If it is visible, try a safe Mount or First Aid step and then use Wondershare Recoverit or a backup to extract files. If the drive is absent, clicks, overheats, or repeatedly disconnects, stop using it and consider professional recovery.

Note: Do not save recovered files to the unmountable drive. Use the Mac's internal storage or another healthy disk so you do not overwrite the source data.

This guide covers six recovery methods for an unmountable Mac drive, plus the connection and detection checks needed to choose the safest option: Wondershare Recoverit, Disk Utility Mount, First Aid, Terminal, Time Machine, and professional recovery.

What Does “Unmountable Drive” Mean on Mac?

An unmountable drive on Mac is a storage device or volume that macOS detects but cannot attach for normal access in Finder. The data may still be present, but the file system, connection, power supply, partition structure, or physical device may prevent macOS from opening it.

The most important distinction is whether the physical disk appears in Disk Utility. A detected disk may be recoverable with software or a backup. A disk that is completely absent after one careful cable, port, and power check may have an enclosure, controller, or hardware failure.

If Disk Utility shows a separate greyed-out volume, APFS container, Macintosh HD, or Boot Camp partition, see the companion guide on fixing an unmountable partition on Mac for partition-level diagnosis.

Common Causes of an Unmountable Drive

• File-system corruption after an interrupted transfer, crash, or improper ejection.
• Unsupported or partially supported file systems on macOS.
• Loose, damaged, or underpowered cables, hubs, ports, or enclosures.
• Partition or volume damage that prevents the file system from mounting.
• Bad sectors, controller failure, SSD wear, or other physical problems.
• macOS, driver, encryption, or permission conflicts.

What to Check Before Recovering Data

1. Stop writing to the drive. Do not copy, delete, format, or install recovery software on the affected source when files are missing.
2. Test one known-good connection. Replace a damaged cable, connect directly to the Mac instead of an unpowered hub, and verify the power adapter for a desktop external drive.
3. Try one compatible Mac or port. A single comparison test can separate a Mac-side connection problem from a drive-side problem.
4. Check the file system. A drive that works on another system may use a file system that macOS cannot natively write or fully support. Do not format it just to make it appear.
5. Open Disk Utility and choose View > Show All Devices. Check whether the physical disk, volume, and any container are detected.

Note: Connection checks should be limited when the drive clicks, overheats, smells unusual, or repeatedly disconnects. Continued use can worsen a failing device.

How to Recover Data from an Unmountable Drive on Mac

Choose the method based on the drive state. If the drive is detected and the files are important, recover or copy the data before repair. If the drive is not detected or shows physical failure, avoid repeated software scans.

Method 1: Use Wondershare Recoverit Before Repairing the Drive

Wondershare Recoverit may scan a detected unmountable drive for supported files when the volume cannot be opened normally. It can be relevant after deletion, formatting, file-system inaccessibility, or an interrupted operation. It is not a partition-repair tool, and it cannot guarantee recovery from overwritten data, an undetected device, or severe physical failure.

1. Install and open Wondershare Recoverit on a healthy Mac location. Do not install it on the source drive.

   

2. Choose Hard Drives and Locations and select the detected unmountable drive.
3. Start the scan and avoid disconnecting the source while it is being read.

   

4. Filter and preview supported files when available.
5. Click Recover and save the results to the Mac's internal storage or another healthy disk.
6. Open several recovered files before attempting First Aid, partition repair, or formatting.

Video Tutorial on How to Recover Deleted Data from SD Card on Mac

Method 2: Mount the Detected Volume in Disk Utility

Use this method when Disk Utility shows the physical disk and the target volume, but the volume is greyed out or absent from Finder.

1. Open Applications > Utilities > Disk Utility.

   

2. Choose View > Show All Devices.
3. Select the specific unmounted volume, not only the physical disk.
4. Click Mount when the option is available.
5. If it opens, copy important files to another healthy location immediately.

Method 3: Run First Aid After Data Is Protected

First Aid checks and repairs some logical file-system problems. It is not a file-recovery method, and a failed repair can leave the volume unavailable. Run it after recovering important files or confirming that the data is backed up.

1. Open Disk Utility and select the affected volume.
2. Click First Aid, review the warning, and choose Run.

   

3. Wait for the process to finish without disconnecting the drive.
4. Review the result. Do not repeatedly rerun a failed repair on an unstable device.

Method 4: Use Terminal to Identify or Mount the Drive

Terminal can reveal disk identifiers and may mount a detected volume when Finder or Disk Utility does not complete the operation. This method is for users comfortable verifying identifiers before running commands.

1. Open Terminal from Applications > Utilities.
2. Run diskutil list and identify the correct disk and volume by capacity.

   

3. For a verified unmounted volume, try diskutil mount diskXsY with the correct identifier.
4. For an APFS device, use diskutil apfs list to inspect detected containers and volumes.

Note: Do not guess the identifier or use destructive commands such as eraseDisk while needed data is still at risk.

Method 5: Restore Files from a Time Machine Backup

Time Machine is useful when the missing files were included in a backup created before the drive became inaccessible. It is a backup restore method, not a repair for the unmountable source.

1. Connect the Time Machine backup disk or open the available backup source.

   

2. Open Time Machine from the menu bar or System Settings.
3. Browse to the folder and date that contain the needed files.
4. Select the files and choose Restore to a healthy destination.

Method 6: Use Professional Data Recovery for Physical Failure

Professional recovery is the safer next step when the drive clicks, overheats, has visible damage, repeatedly disconnects, or remains absent from Disk Utility after one careful connection test. It is also appropriate when the files are critical and software recovery could worsen the source.

• Stop repeated power cycles, scans, repairs, and formatting.
• Do not open the drive enclosure or attempt a component swap without technical guidance.
• Tell the provider the device type, connection, file system, encryption status, symptoms, and backup history.
• Ask how the evaluation is performed and whether the data will be recovered to a separate destination.

Success is not guaranteed, and cost and timing vary. However, continued software attempts can be riskier than a professional evaluation when the device has physical symptoms.

How to Prevent Future Unmountable Drive Problems

• Keep at least one current backup of important files.
• Eject external drives before disconnecting them.
• Use stable cables, direct ports, and adequate power.
• Keep macOS and necessary file-system support current.
• Monitor unusual noise, heat, slow access, or repeated disconnects.

Conclusion

When a Mac cannot mount a hard drive, first determine whether the physical device is detected. Test one known-good connection, inspect Disk Utility, and try Mount only when the volume is visible. If important files are inaccessible, recover them or restore them from Time Machine before First Aid, partition changes, or formatting.

Wondershare Recoverit may help scan a detected unmountable drive, while professional recovery is safer for clicking, overheating, repeatedly disconnecting, or completely undetected devices. If Disk Utility shows a specific partition or APFS volume problem, use the companion partition guide for that narrower troubleshooting path.