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• Find External Hard Drive Mac
• Best External Hard Drives For Mac
• External Hard Drive Repair App For Mac Computer
• External Hard Drive Repair App For Macbook Pro
• External Hard Drive Recovery Mac

Disk Utility User Guide

Disk Utility can check for and fix errors related to the formatting and directory structure of a Mac storage device.

Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.

To check and repair a disk, you need to run First Aid on each volume and container on the storage device in turn, then run it on the storage device itself.

If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it.

1. In the Disk Utility app on your Mac, choose View > Show All Devices.

   If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon .

   Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Recovery window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).

2. In the sidebar, select a volume, then click the First Aid button .

3. In the First Aid dialog, click Run, then follow the onscreen instructions.

4. When the First Aid process is complete, click Done.

5. Repeat steps 2 through 4 for each volume on the storage device.

6. In the sidebar, select a container, then click the First Aid button .

7. In the First Aid dialog, click Run, then follow the onscreen instructions.

8. When the First Aid process is complete, click Done.

9. Repeat steps 6 through 8 for each container on the storage device.

10. In the sidebar, select the storage device, then click the First Aid button .

11. In the First Aid dialog, click Run, then follow the onscreen instructions.

12. When the First Aid process is complete, click Done.

If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.

Mac OS Diagnostics The MacOS has great tools for testing hard drives. This program is called First Aid. Always backup your data before running First Aid scans of your hard drive. If there is a bad sector, any data that may have been accessible before running “Repair Disk” will likely become inaccessible once the bad sector is re-allocated. And his detailed external hard drive repair tutorial must help you, which is aimed at smoothing the way for you to fix a corrupted external hard drive. Another advice is that you should take good care of the data stored on it during or after external hard drive repair.

Hard disk might be corrupted due to different reasons and the external hard drive spoil more easily. Here we explore the different reasons for which hard drives can become corrupt and show you how to repair a corrupted external hard drive and recover data from a corrupted external hard drive easily. Repair a storage device in Disk Utility on Mac Disk Utility can check for and fix errors related to the formatting and directory structure of a Mac storage device. Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t. The next sections describe three different methods to repair a corrupt APFS or HFS+ solid-state drive. 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.

5 Best Tools to Recover Files from External Hard Drives. External hard drive data recovery is easy when you know what the best data recovery tools are. Based on our experience, user reviews, and features, we’ve selected top 5 best tools for recovering external hard drives. Although the best hard disk repair software offers the file recovery function, it is also important to backup hard drive data before you use them to repair hard drive; As an old Mac user, the reasons I pick Cisdem Data Recovery is because of the clear guidance interface, timely data recovery, formidable features and tremendous speed.

• If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.

  • If you can replace a file or re-create it, delete it.

  • If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.

• If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.

If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.

If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.

This tutorial article shows you how to repair a corrupted external hard drive without losing any data with professional hard drive recovery solutions. If your external hard drive, hard drive partition, USB drive, SD card, etc. devices suddenly corrupted or crashed, follow to troubleshoot the issue by yourself and restore valuable data now.

Have you ever wondered what causes your storage devices broken down, such as external hard drives, USB drives, SD cards, etc. ? This article demonstrates a full range of technical solutions to hard drive corruption issues.

Try your best to repair an external hard drive according to the associated symptoms. It's the most efficient way to troubleshoot an internal or external HDD with unusual signs of making a clicking noise, overheating, not opening, not responding, or not showing up. Since a disabled hard drive will potentially endanger data, you shall use EaseUS Data Recovery Wizard to rescue data as soon as possible.

What Causes a Corrupted External Hard Drive

A lot of reasons will spur a hard drive issue, preventing it from functioning normally. These are some examples.

• Improper operation: unplug a connected device from your PC without safe ejection
• Viral damage or malware infection
• An excessive number of hard disk bad sectors
• File system errors
• Outdated/corrupted driver
• A variety of error messages imply a hard drive problem

People who go well along with an active storage drive usually are with good habits. For instance, use devices properly, update drivers once or twice, check the virus with anti-virus software regularly. What if the error has already occurred, how to fix it? Here below, we'll show you how to repair a corrupted external hard drive without losing data at home. Be your own expert by carefully reading through, and following by to revive your external hard drive.

How to Restore Corrupted System Files from the External Hard Drive

Missing or corrupted system files are responsible for a hard drive with unusual symptoms. It usually occurs when there is a problem during the file save process. So when your hard drive seems to be damaged and you cannot open it, maybe you need to repair the crashed system files at first.

• Open Start and type:cmd, hit Enter to open Command Prompt Window;
• Type: chkdsk g:/f(if the external hard drive is Driver g:), click Enter.

chkdsk g:/f

Continue with the other command: sfc /scannow and hit Enter.

After the repair process finished, you'll see Windows Resource Protection did not find any integrity violations message if no corruption has found. Otherwise, it'll fix it automatically.

How to Recover Data from the Corrupted External Hard Drive

When your storage device suddenly stopped working, the most urgent thing is about how to recover data or files from it. Here below you'll find two methods to get this issue fixed now:

Method 1. Recover Data with other USB Cable or New PC

If you are not sure whether the device has been in trouble, you can connect it with a new USB port or even a new PC to see whether it can be detected or not. If the drive can be read, then you can directly use your data on the external hard drive.

By chance the hard drive cannot be detected on the other computer, check its status in Windows Disk Management, and try to change a drive letter and paths to show it up.

Step 1. Right-click on This PC, select Manage. Under the Storage section, click Disk Management. Or, use an alternative way to open Disk Management in Windows 10/8.1/8/7: Press Windows + R keys, type diskmgmt.msc in the Run box, and hit Enter.

Step 2. Right-click on the SSD partition and select Change Drive Letter and Paths….

Step 3. Among Add, Change, and Remove, click the 'Change' button, and then select a drive letter from the list. Click 'OK' to assign a new drive letter to the problematic hard drive.

Method 2. Recover Data with Hard Drive Recovery Software

As long as your hard drive is detectable by Windows Disk Management, let it be RAW, inaccessible or with other strange characters, powerful hard drive recovery software can help you get data out from it with simple clicks. Here we'd like to recommend you try EaseUS hard disk recovery software which allows you to restore lost data on all storage devices under Windows 10/8/7. Just download, install and activate it to follow below steps recover precious data from your connected external hard drive now:

Step 1. Choose the external hard drive

Since you're going to recover data from the external hard drive, run EaseUS Data Recovery Wizard and choose the exact drive where you lost data. Click Scan.

Step 2. Scan for lost data

The software will start immediately to scan all over the selected drive for all lost data. During the scan, you could see more and more data showing up in the results.

Step 3. Preview and recover data

After the scan is over, check the scan results for the desired data. You can preview the file by double-clicking on it. Click Recover and choose another location to save the recovered data.

After restoring data from the affected external hard drive, you may also want to know how to repair the corrupted device. Follow to find the answer now.

How to Repair Corrupted External Hard Drive

Here in this part, we'll show you two methods to format a corrupted external hard drive and get it back to normal again. Before proceeding, it's necessary to know what kind of hard drive problems you can use the disk formatting method to solve.

Theoretically speaking, disk formatting should be done with caution because it erases data and removes programs installed. However, it's quite useful. Disk formatting is the configuring process of data storage media for initial, so it can solve the most common hard drive issues like 'Disk is not formatted, do you want to format it now?', or hard drive is not showing up and displaying itself as RAW. Moreover, it can scan and repair bad sectors, and sometimes remove sophisticated viruses.

Method 1. Quick Fix Corrupted External Hard Drive by Formatting

Step 1. Connect the impaired external hard drive to the PC.

Step 2. Right-click the device and selectFormat.

Step 3. Set a new file system - NTFS or FAT etc. to the drive and click OK to finish the process.

Method 2. Repair Corrupted External Hard Drive with Partition Manager Software

The other applicable disk formatting tool is from a third-party application called EaseUS Partition Master Free. It does the same work as the Windows File Explorer, but at times when you cannot see the hard drive's drive letter there, you can download this piece of software to perform the formatting.

Step 1: Launch EaseUS Partition Master, right-click the partition on your external hard drive/USB/SD card which you want to format and choose the 'Format' option.

Step 2: Assign a new partition label, file system (NTFS/FAT32/EXT2/EXT3), and cluster size to the selected partition, then click 'OK'.

Step 3: In the Warning window, click 'OK' to continue.

Step 4: Click the 'Execute Operation' button in the top-left corner to review the changes, then click 'Apply' to start formatting your external hard drive/USB/SD card.

How to Repair Corrupted External Hard Drive Without Formatting

So how to repair corrupted external hard drive without formatting? If you don't want to format it, or if the drive becomes unallocated, it won't work with the formatting method. Don't panic, you can head to the other two methods.

Method 1. Repair Corrupted External Hard Drive with Windows Tools, no Formatting

There are Windows tools available that supposed to get a problematic hard drive back to normal, and each tool is worth a try.

• Open 'This PC', right-click the drive that has bad sectors, and choose 'Properties'.
• Go to the 'Tools' tab.
• Click 'Check' to check and repair the bad sectors on your hard disk.

Or, you can use administrator privilege to remove bad sectors permanently with the chkdsk command. The Command Prompt functions in the same way as the Windows tool.

• Press Windows + R keys simultaneously, type cmd and hit Enter.
• Enter the command: chkdsk E: /f /r /x and hit Enter. (Replace E with your own drive letter)

chkdsk E: /f /r /x

If you don't have any technical know-how and want to minimize data risks, using third-party software could be a better choice. The Command line is suitable for computer professionals since wrong commands can cause severe problems. Therefore, we strongly recommend you try an automatic command line alternative.

EaseUS Tools M is a practical computer fixing tool that is safe and light-weighted. It's a perfect alternative to CHKDSK command. Use this one-click tool to solve your computer issues.

To fix file system error or disk error:

Step 1: DOWNLOAD EaseUS Tools M for Free and install it.

Step 2: Open the software and select the 'File showing' option.

Step 3: Choose the drive and wait for repairing. After the operation completes, click the 'View' button to check the drive.

Method 2. Update Corrupted/outdated Driver in Device Manager

This is an imperative option to force show up an external hard drive. Sometimes, the driver issue is the main culprit for a hard drive problem, so you can try to fix it by reinstalling a driver.

Find External Hard Drive Mac

• Right-click 'This PC' and choose 'Properties' > 'Devices Manager'.
• Click on 'Disk drives', right-click on your hard drive that is not showing up in Windows and choose 'Uninstall device'. (Make sure you have selected the correct USB device.)
• In the prompt asking you to confirm the removal, click 'OK'.
• Restart your computer and reconnect the drive to the PC. After the computer restarts, the driver will be automatically installed.

Method 3. Run CMD to Repair Corrupted External Hard Drive Without Formatting

This Diskpart command will erase all data on your corrupted device. Therefore, please recover data from the corrupted external hard drive first before you run CMD to repair the drive.

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• Press Win+R, type:cmd and click Enter;
• Type: diskpart and hit Enter;
• Type: list diskand hit Enter;
• Type:select disk 0 and hit Enter; (0 stands for the drive letter of your corrupted external hard drive.)
• Type: cleanand hit Enter; (This will wipe all data on the drive.)
• Type: create partition primary and hit Enter;
• Type: exit and hit Enter to finish the process.

How to Maintain a Healthy Hard Drive

All computers have a hard drive installed in them, which is used to store files for the operating system, software programs, and a user's data. A computer cannot come into play without a hard drive whirling. To correctly cooperate with a hard drive, or an external one, you must possess some necessary know-how skills for keeping a storage device healthy, and in turn, to prolong its life.

Thereby, we think these three routine jobs should be carefully implanted in daily use.

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1. Everyday data backup

You can back up a whole hard drive data, a certain partition, user archives or even operating system. This is the most guaranteed way of attempting all chances of hard drive recovery without worrying about data loss (e.g. Some fixes within this page are meant to erase data, making it unrecoverable). There are native backup tools for Windows, namely Backup and Restore for Windows 7, 8.1 and 10, and File History for Windows 8. But modern people tend to prefer third-party free backup software, they choose over more intuitive, user-friendly, versatile and more features involved backup plans to replace such a dull and flat Windows utility. EaseUS Todo Backup Free perfectly meets an everyday backup of a hard drive, partition, files, folders, etc.

2. Periodic disk cleanup and system optimization

Remove junk files, useless but extremely large files or system/browser cache files that occupy precious disk space, to avoid the risk of the computer becoming slow. Why not use simple disk cleanup to boost hard drive performance?

In addition, the longer you use the machine in a settled location, the more dust and debris in the air will accumulate and cause the hard drive overheating and malfunctioning. You may use a small piece of cotton rag and a dip of alcohol to clean it by yourself, and a cotton bud is also a good choice for the inside areas.

3. Take advantage of Power Save and Sleep Modes

External Hard Drive Repair App For Macbook Pro

Though there are large brands that announced a longer lifespan, you need to accept the truth that the less time your drive is running, the longer it will last over the lifetime.

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Therefore, turn off the hard drive after some time of complete inactivity. Likewise, when your computer is idle, try to utilize the Power Save and Sleep Modes, to keep it from performing certain general maintenance tasks such as defragmentation, checking Windows updates, third-party activities, etc.