Mac Partition Recovery | Step-by-step Guide to Lost or Deleted Partition Recovery on Mac

This Mac partition recovery article will guide you through all the possible solutions to recover deleted, lost, or missing partitions on any Mac system. By the end of this article, we will arm you with essential knowledge to help you restore partitions from any internal or external drives and regain access to valuable data.

A partition is a defined storage space on an internal or external device that enables users to segment their drives into various sections. This segmentation process is vital for many reasons, including allowing users to install multiple operating systems, organize data more effectively, enhance system performance, and provide a more structured way to manage files and other applications.

However, partitions can sometimes get deleted, lost, or inaccessible for various reasons. Accidental deletion is a common reason for volume formatting, file system corruption, malware or virus attacks, physically damaged drives, etc. 

This situation can be stressful, especially if the partition contains critical data. Fortunately, various solutions exist to help you recover lost or deleted partitions and repair problematic partitions using tools like First Aid. 

Table of Contents:

• How To Recover Partitions on Mac?
1. Check for Hidden Partition Using the Disk Utility
2. Recover Deleted, Lost Files from Partitions Using the Backups
3. Mac Disk Partition Recovery Using Rikvr Mac Data Recovery Software
4. Restore Deleted Partitions on Mac Using Professional Mac Partition Recovery Services
• How To Repair Partitions on Mac?
• Conclusion

Common Causes of Mac Partition Loss and How to Prevent It

Understanding why partitions disappear is the first step toward recovering them and toward making sure it never happens again. The most frequent cause is accidental deletion, which can occur when a user reformats a drive, mistakenly deletes a volume inside Disk Utility, or runs a third-party utility that overwrites partition table data. Even a single misclick in Disk Utility can wipe an entire partition instantly, with no Trash Bin to catch it.

Other common culprits include file system corruption caused by improper ejection of external drives, sudden power loss during a read/write operation, or macOS update failures that leave the partition table in an inconsistent state. Malware and ransomware attacks are also a growing threat, particularly for external drives shared across multiple machines. Physically damaged drives whether from drops, moisture, or hardware failure, can corrupt the partition map at a hardware level, making software-based recovery more difficult.

To protect yourself going forward, follow these core prevention habits:

• Always eject external drives safely using the Eject button in Finder before physically unplugging them.
• Enable Time Machine and schedule automatic backups to a dedicated external drive or NAS device.
• Run Disk Utility’s First Aid check on your drives at least once a month to catch file system errors early.
• Avoid using the same external drive across both Mac and Windows systems without a compatible file system format (e.g., exFAT), as format conflicts can corrupt partition tables.
• Keep macOS updated Apple frequently patches file system vulnerabilities in incremental OS releases.
• Store a second backup in cloud storage (iCloud, Backblaze, or Dropbox) for critical partitions containing irreplaceable data.

How To Recover Partitions on Mac?

Mac partition restoration can be extremely necessary, especially if the files or data saved are important. This section helps you unhide any hidden partitions using the Disk Utility. Later, we talked about backups and how to restore them in case you lose your partitions and the data within them. The last solution talks about professional partition recovery software for Mac.

Method 1: Check for Hidden Partition Using the Disk Utility

At times, you might have hidden some of your partitions. One might do it intentionally or accidentally, or someone else might have hidden some of their partitions.

In all of these cases, your partitions will disappear or are missing. 

The easiest way to restore hidden Mac partitions is to unhide them using the Disk Utility.

1: Open Disk Utility by navigating to Applications > Utilities > Disk Utility. You can also use Spotlight; hit the Command + Space option, type Disk Utility, and hit Enter.

2: In the Disk Utility window, select the View option from the menu and click the Show All Devices option. This will display a list of all the internal and connected drives and their partitions and volumes.

If the missing partitions and volumes do not appear. Try unplugging and re-plugging drives and restarting your Mac to force a rescan of all the connected disks.

3: Any hidden partitions or volumes will get greyed out. Select the Hidden partitions and click on the Mount button. 

Suppose the partition or the volume gets mounted successfully. Then, you can see the drive in the Finder and the Disk Utility window. 

If you have deleted the Mac partitions, you can restore the files and folders from the deleted partitions using Backups. If you want to recover Mac partitions after deletion, not just files. I suggest you try RIKVR Mac Data Recovery Software.

Method 2: Recover Deleted, Lost Files from Partitions Using the Backups

Backups are one of the easiest solutions for recovering partitions. One might have manually taken backups and saved them on external storage devices such as external Hard Drives or SSDs, used an in-built tool like Time Machine to take Time Machine backups, or used any third-party tool to take backups of important data.

You can use backups saved in a different location if copied and pasted into the original partition or volume. You can also download them if saved in Cloud storage, such as iCloud.

In the case of Time Machine backups, you can try the following steps.

Time Machine is a built-in backup feature in the Mac system. This allows users to automatically back up their entire system, including various file types and applications. 

1: Connect your Time Machine backup drive to your Mac system.

2: Launch the Time Machine application and enter the Time Machine. 

3: Use the timeline on the right side of the screen or the arrows to navigate the different backup dates or restore points.

4: Locate the partition or the files saved in the partition you want to restore. Select the items and click on the Restore button.

5: The Time Machine will restore the selected files and the data to their original location on your Mac system.

6: After the restoration, check the partitions and ensure the lost partitions have been recovered successfully. Open Disk Utility > Applications > Utilities > Disk Utility to view the partition map and hierarchy and confirm that the partition is now visible and accessible.

Try the next solution if you want to recover Mac partitions without backups. 

Method 3: Mac Disk Partition Recovery Using RIKVR Mac Data Recovery Software

RIKVR is one of the best solutions for helping any Mac user recover files, deleted partitions, and lost partitions from any Mac computers or external storage devices that were deleted, lost, missing, or inaccessible.

The tool is built with highly advanced search algorithms that delve deeper into the drive to find and recover deleted partitions on Mac.

Steps To Use RIKVR Data Recovery Software for Mac

1: Download and Install RIKVR, the professional Mac Partition recovery tool on your system.

2: Launch the tool, and from the main screen, select the partition or the drive from where you want to recover Mac hard drive partitions and click on the Scan button.

3: Upon completing the drive scanning process, the tool will display a complete list of all the partitions recovered, along with the files, folders, and other data from the selected drive.

4: Double-click on any recovered data to preview it for free. 

5: Select all the partitions and the data or multiple files you want to restore from the recovered data list. Click on the Recover button. The tool will prompt you to select a location to save the recovered data.

6: Upon completing the Mac disk partition restoration process, I suggest you navigate to the provided location and verify the recovery process.

You have now completed this DIY Mac partition retrieval process. I have explained in-depth about the RIKVR software and how to use this Mac partition recovery utility to recover deleted, lost, missing, or even inaccessible partitions from any internal Mac system or external storage device. 

If you overwrite partitions or volumes or physically damage the storage device, try Mac partition recovery expert services.

How to Recover a Deleted Partition on Mac Using Terminal

If Disk Utility’s graphical interface cannot detect your missing partition, macOS Terminal gives you lower-level access to the disk subsystem through the diskutil command-line tool. This method is particularly useful when recovering a deleted partition on an external hard drive on Mac, or when the partition table has become partially corrupted but the underlying data is still intact. Before proceeding, make sure you have administrative privileges and that you are working on the correct disk identifier using the wrong disk number can cause irreversible data loss.

Follow these steps to attempt Terminal-based partition recovery:

1. Open Terminal by navigating to Applications > Utilities > Terminal, or search for it using Spotlight (Command + Space, then type Terminal).
2. Type diskutil list and press Enter. This displays every disk and partition currently visible to macOS. Note the disk identifier of the target drive (e.g., /dev/disk2).
3. Type diskutil listFilesystems to view all supported file system formats, helpful if you need to identify what format the lost partition used (APFS, HFS+, ExFAT, etc.).
4. If the partition still appears in the list but is unmounted, run diskutil mount /dev/disk2s1 (replace disk2s1 with your actual partition identifier) to remount it.
5. If the partition is truly missing from the table, run diskutil repairDisk /dev/disk2 to attempt an automatic repair of the partition map. This command rebuilds the partition table structure where possible.
6. After any repair attempt, run diskutil list again to verify whether the partition has reappeared. If it has, use diskutil mount to bring it online.

It is important to note that Terminal commands can repair the partition structure but cannot recover data that has been overwritten. If the partition remains missing after these steps, stop all write activity to the drive immediately and proceed to a dedicated partition recovery software tool or a professional data recovery service. Writing new data to the disk after deletion significantly reduces the chance of a successful recovery.

Method 4: Restore Deleted Partitions on Mac Using Professional Mac Partition Recovery Services

Methods like unhiding the hidden partitions, restoring backup copies of the data from external or Time Machine backups, or using specialized data recovery tools have failed to recover the partition on Mac OS X and other versions. You can try professional Mac partition recovery services that provide specialized services to retrieve lost, deleted, or missing partitions in all minor or severe cases of critical data loss, severe drive damage, failure, and other complex data loss scenarios.

Do a quick Google search, and you will get to know hundreds of service providers near you. Choose reliable and genuine service providers who offer high success rates, transparent pricing policies, and policies to safeguard and protect your data from misuse.

I am sure you were able to recover your lost or deleted partitions. Many users have complained that their partitions have become corrupt or problematic. 

How To Repair Partitions on Mac?

If your partitions or volumes are corrupt, the system will run a first-aid scan to repair any minor issues and problems with the partitions.

Method 1: Mac Partition Repair Using First Aid

First Aid is a built-in feature in the Disk Utility application on Mac systems. The tool is designed to diagnose, identify, and repair issues with disk volumes and partitions, including file system corruption, partition table issues, and partition errors that make them inaccessible to the user and the operating system. 

1: Launch the Disk Utility. Navigate to the Applications > Utilities > Disk Utility.

2: The Disk Utility will display a list of all the internal partitions and volumes and all other external connected drives in the left pane of your screen.

3: Select the problematic partition or the volume and click the First Aid button at the top of the Disk Utility window. A dialog box will appear on your screen to confirm the process. Click on the Run button to proceed.

4: The Disk Utility will start the repair process. You must wait until you complete the entire scan. 

5: Once the First Aid process is complete, it will display a summary of all the actions taken, the problems that got fixed. And the errors that could not be repaired. (In such cases, it might suggest further actions you can take to troubleshoot the error.)

Conclusion

This brings us to the end of our discussion. Where we have explained the Mac partition recovery process in depth. I also explained first aid as a solution to help you repair any problematic and corrupt partitions. 

Recovering data is a cakewalk compared to recovering partitions deleted or lost on a Mac system. Fortunately, you can easily recover data with the right tools and techniques. This article will walk you through various solutions. Such as unhiding the hidden partitions using the Disk Utility, restoring backups from external drives and the cloud, Time Machine backups, and using professional data recovery software and other third-party service providers. 

Following the steps outlined in this article can massively increase your chances of recovering your lost partitions. Always back up all the important data. Run antivirus scans regularly to eliminate viruses or malware threats and prevent corruption. All of these tips will ensure your Mac’s storage partitions remain well-maintained.

Frequently Asked Questions About Mac Partition Recovery

Do I really need a recovery partition on my Mac?

Yes, the macOS Recovery partition is a critical safety net built into every modern Mac. It contains essential tools including Disk Utility, Terminal, and the macOS reinstaller, which you can access even when your main operating system fails to boot. Without a functioning recovery partition, tasks like erasing and reinstalling macOS, repairing disk permissions, or resetting a forgotten password become significantly more difficult. Apple automatically creates this hidden partition during a macOS installation, and you should never manually delete it. If you discover it is missing, you can restore it by reinstalling macOS from Internet Recovery mode.

Is there a free disk recovery software for Mac?

Yes, several free options exist for Mac partition and disk recovery. Apple’s own Disk Utility (built into macOS) is completely free and can repair many partition table issues using its First Aid feature. TestDisk is a powerful open-source, command-line tool capable of recovering lost partitions and repairing boot sectors at no cost, though it requires comfort with Terminal. For file-level recovery from a lost partition, PhotoRec (bundled with TestDisk) recovers hundreds of file types for free. Most commercial tools like RIKVR also offer a free scan so you can verify whether your lost partition data is recoverable before committing to a purchase.

How do I reset my Mac when Command + R isn’t working?

If the standard Command + R shortcut for Recovery Mode is not responding, your Mac has alternative recovery methods. On Intel-based Macs, hold Option + Command + R at startup to boot into Internet Recovery, which downloads a recovery environment directly from Apple’s servers over Wi-Fi or Ethernet. On Apple Silicon Macs (M1, M2, M3), Command + R does not apply instead, shut down your Mac completely, then press and hold the Power button until you see the startup options screen, then click Options to enter Recovery Mode. If Internet Recovery also fails, check your internet connection, try a wired Ethernet connection via a USB-C adapter, or contact Apple Support for a bootable macOS installer via USB.

How do I fix a corrupted disk on a Mac?

The first tool to reach for is Disk Utility’s First Aid feature. Open Disk Utility, select the affected disk or partition from the left sidebar, and click First Aid > Run. First Aid scans the disk for file system errors and attempts to repair them automatically. For more serious corruption that First Aid cannot resolve, boot into macOS Recovery Mode (Command + R on Intel, or hold Power on Apple Silicon) and run First Aid from there, as this allows the tool to repair the startup disk itself. If the disk still shows errors, the fsck command in Terminal offers a deeper repair scan. In cases where the disk has physical damage or the corruption is beyond software repair, professional data recovery services with cleanroom facilities are the safest remaining option.

What is the difference between partition recovery and file recovery on Mac?

Partition recovery refers to restoring the partition structure itself rebuilding the partition table entry so that macOS recognizes the volume and can mount it again. File recovery, by contrast, extracts individual files and folders from a disk, even when the partition table is absent or unreadable. In practice, if your partition has been deleted, a good partition recovery tool will first attempt to reconstruct the partition map. If that succeeds, all original files appear intact. If the partition table is too damaged to rebuild, the tool falls back to file-level scanning reading raw disk sectors to reconstruct individual files without relying on the partition structure at all.