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Summary: In this blog, we’ll share three different methods to repair a corrupt Mac solid-state drive on macOS Catalina 10.15. The methods we’ll cover are:
1. Repair corrupt Mac solid-state drive by using Disk Utility
2. Repair corrupt Mac SSD by using Terminal
3. Repair Mac corrupt SSD by using FSCK command
Download the free-to-try Mac data recovery software to recover data from a corrupt SSD.
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Mac solid-state drive (SSD) is purposefully formatted in Apple File System (APFS), the proprietary file system of Apple Inc. that handles flash storage medium effectively in macOS. An APFS formatted SSD is prone to corruption just like any HFS+ formatted hard drive, and a corrupt Mac SSD may not load macOS. Or your external corrupt SSD may turn invisible or inaccessible from Mac. Consequently, you are not able to access the data stored on your corrupt SSD.
Common Reasons for APFS/HFS+ SSD Corruption
- Improper formatting of SSD
- Partial reinstallation of macOS
- Unsafe ejection of the external SSD
- Sudden power outage or power surge
- Corruption or deletion of APFS container
- Abnormal Mac shutdown
- Hardware failure in SSD
The next sections describe three different methods to repair a corrupt APFS or HFS+ solid-state drive.
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1. Repair Corrupt Mac Solid-State Drive by Using Disk Utility
For minor corruption in your APFS formatted SSD, you can use Disk Utility. The utility provides a ‘First Aid’ option that checks SSD for file system corruption and fixes it. To repair a corrupt APFS SSD, follow the next steps:
- For external SSD, go to Finder > Application > Utilities. Double-click Disk Utility to launch the disk management app.
- For internal SSD, start or restart your Mac and hold Command + R keys. Release them when the Apple logo appears. Mac boots into macOS Recovery mode. From the macOS Utilities window, select Disk Utility, and click Continue.
- From the sidebar of Disk Utility, select the APFS or HFS+ disk or volume that you wish to repair.
- Click the First Aid tab, then click Run. Let Disk Utility repair your corrupt SSD.
When the SSD is about to fail, Disk Utility shows a message stating that you will not be able to repair the drive. Disk Utility also asks you to back up your data and replace the disk.
2. Repair Corrupt Mac SSD by Using Terminal
The Terminal app in your macOS is a powerful tool to perform low-level tasks and operations on volumes and containers. So, when Disk Utility fails to repair your corrupt SSD, try Terminal commands to fix logical damages.
- For external SSD, go to Finder > Applications > Utilities. Double-click Terminal to launch the application.
- For internal SSD, boot your Mac into macOS Recovery mode as explained before. From the top Menu Bar, go to Utilities > Terminal to launch the Terminal app.
- At the command prompt, type diskutil list, then hit Return. Note the identifier of the SSD.
- Type diskutil verifyVolume SSD_ID, then hit Return. If your SSD is the startup disk, then use / as the SSD identifier. Else, type the SSD identifier as noted earlier.
- During verification, if no error appears, SSD repair won’t be useful. If your Mac drive is corrupt and needs to be repaired, type diskutil repairVolume SSD_ID then hit Return. Here, use the appropriate SSD identifier.
3. Repair Corrupt Mac SSD by Using FSCK Command
When Disk Utility fails to repair corrupt APFS formatted SSD on Mac, try the file system consistency check (fsck) command. Steps are as follows:
- Start or restart your Mac and hold Command + S keys. Release them when white text appears on the screen. Mac boots into Single User mode.
- At the command prompt, type diskutil list, then hit Return. Note the disk# of the SSD.
- Type /sbin/fsck_apfs –fy/dev/disk#, then hit Return.
- If the ‘File system was modified’ message appears, rerun the command,then hit Return.
- When ‘The volume (name) appears to be OK.’ message appears, type reboot. Let your Mac boot normally.
Recover Data from Mac Corrupt Drive SSD
If none of the above repair methods fixes your corrupt Mac APFS/HFS+ SSD, use Stellar Data Recovery Professional for Mac to recover your inaccessible data from the corrupt SSD. Steps are as follows:
Step 1: Download and install the free trial version of Stellar Data Recovery Professional for Mac on your MacBook, iMac, or Mac mini.
Step 2: In the ‘Select What To Recover’ screen, you can recover everything or customize your scan to choose from Documents, Emails, Videos, Audio, and Photos. Click Next.
Step 3: In the ‘Recover From’ screen, choose the corrupt SSD from where you want to recover your data, then click Scan. The software looks for your recoverable files. The scanning process may take some time depending on the size and condition of your storage media.
Note: If the desired result is not found, run Deep Scan by clicking the ‘Click Here’ link at the bottom of the software screen.
- If SSD partition is not visible, from the ‘Recover From’ screen, click ‘Can’t Find Volume’ then click Scan.
- Choose the Mac SSD that contained the partition and click Search. You can further Deep Scan if the desired partition is not found.
- Under the ‘Partitions Found’ section, choose the desired partition and click Scan.
Step 4: Let the scan process to complete. Click OK after the scan is over. If needed, you can abort the scanning process in between after the initial phase by clicking Stop. Also, you can save the current scan information that lets you postpone the recovery process. This scan information can be loaded later to recover your crucial data. Just make sure the affected drive is connected to your Mac before loading the scan information.
Step 5: Click on a file to see the preview. Select the desired files from the list and click Recover.
Step 6: On the Recover message box, click Browse and locate the destination where you wish to save your recovered data. Click Save. Your recovered data from the corrupt APFS SSD will be saved at your desired location.
Note: The trial version of Stellar Data Recovery Professional for Mac allows unlimited free SSD scan and file preview. To save your recoverable data from the corrupt SSD, activate the software.
To know more about the software and the data recovery method, watch the following video:
Read More: Recover Data from non-booting Mac
Conclusion
Mac SSD corruption is quite common. So, to protect yourself from data loss, back up your Macintosh HD by using the Time machine. In case you don’t have Time Machine backup, try the three methods mentioned in the blog to repair SSD corruption. But it is always advisable to select the right approach when it comes to your precious data.
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Stellar Data Recovery Professional for Mac is one such solution that you must implement immediately and restore your lost and deleted data from a severely corrupt, formatted, or inaccessible APFS SSD. The software can also help you recover your inaccessible data from a corrupt HFS/HFS+ formatted hard drive or any other storage medium formatted in ex-FAT, FAT, or NTFS.
Mac computers, whether you have an iMac, MacBook Pro, MacBook Air, or another Mac device, all have a finite amount of space. How you use it depends how quickly, or not, that space fills up and whether you need to add more space — either internally (such as upgrading to an SSD), or connecting to one or more external hard drives.
One thing you may not know is that the Mac boot drive is already partitioned. In all fairly recent models, the boot drive contains a secret partition that includes the macOS Recovery System, some essential Mac first aid tools and an installer, should, for any reason, your macOS fail to install or reboot.
Before we go into how to partition a Mac hard drive or SSD, let’s consider the benefits, and what you would need to do before partitioning a hard drive.
Benefits of making a partition in a Mac hard drive
One of the main reasons for implementing a partition is to run more than one operating system, such as macOS on one and Windows on the other. Or you can run two versions of the same OS in both sides of the partition, all from a single disk. Each disk drive, with its own volume, is found and treat separately in the Finder.
Once you know how to partition a hard drive on Mac, or how to partition an external hard drive on Mac, you can format and manage them separately, effectively giving you two computers within one. Although, if you want to use the other volume to run an earlier version of your Mac — which you can, using Time Machine, the volume for that side has to be twice as large as the space it requires.
What to do before partitioning a hard drive
Before going ahead with a partition, it’s always useful to tidy your Mac up. Most users find they have way more clutter and junk than they think. Between old folders and documents, images and videos, apps taking up space, hundreds of email attachment downloads and local iOS backups, many people find they have at least 62GB of junk they simply don't need. We recommend downloading CleanMyMac X, a powerful Mac cleaner, ideal for decluttering your Mac before creating a partition.
How to partition a hard drive or SSD on Mac
There are several ways this can be done.
1. Use Boot Camp
Boot Camp is especially useful if you want to run Windows on your Mac. With Boot Camp comes Boot Camp Assistant, a handy app for partitioning your hard drive space so that one disk drive can run and operate macOS, and the other, Windows.
Following the on-screen instructions of this Mac app, you can partition your hard drive or SSD space to ensure that Windows will run smoothly on your Mac, almost as if it was operating on a native Windows PC or other device.
However, for those who don't want to partition Mac for that purpose, you can use Disk Utility.
2. Use Disk Utility
Disk Utility is another Mac application that will repair and, as needed, partition disk drive spaces.
As a Mac partition manager, it is a useful app that sits within your Utilities folder, inside your Applications folder.
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Before starting a Mac partition exercise, it’s worth fully backing-up the folder you want to copy using Carbon Copy Cloner. Another useful tool that gives you an instantly bootable copy of the drive you are going to partition, working on the assumption that if anything goes wrong during this process, you are going to lose everything that is on that hard drive. So with a backup, nothing can go wrong, and if it does, you can easily fix it.
Before partitioning:
- Clone the drive.
- Make sure the clone has worked and with your cloned drive you can boot this up from the startup menu.
- Plug the clone in and go to System Preferences > Startup Disk.
- Check the cloned drive works, and then you can partition without any worries.
Now you are ready to partition hard drive on Mac, starting with the following:
- Press Command-Shift-U or go to Utilities in the Applications folder.
- Double-click the Disk Utility application.
- In Disk Utility, select your Mac’s internal drive (or an internal SSD).
- You should see two options: First Aid or Partition.
- Click Partition.
- Click the ‘+’ below Partition Layout.
- Now a new Partition will appear, and you can change the size according to what you need.
- Give this new drive a name.
- If it hasn't worked exactly as you want, you can always click Revert to unpartition hard drive on Mac.
- Or, once you are happy with the size, click Apply. You may also be asked to click a lock symbol in the bottom left-hand corner to confirm everything.
But don't worry if you want to make changes down the road. Everything you have done is reversible, so you can change the size or repartition hard drive on Mac.
Once the partition is done (which doesn't take as long as you might imagine) you will have a completely new hard drive or internal SSD, identical to your original, except without anything in it. Upload anything you need, or use the cloned version to store everything that was in the original hard drive - which still exists - in this partitioned version.
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Within Disk Utility, you have the option of increasing or decreasing the size, erasing altogether (just remember to backup anything you need first), which will restore the space lost in the partition to your primary hard drive. Always backup before making any changes to a partition.
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And remember, before making a partition, clean up your Mac from all the junk it contains. The fastest and the safest way to do that is to use CleanMyMac X. Try it today to rid your system of unwanted files and enjoy improved performance.