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Disk Utility User Guide
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.
If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.
In the Disk Utility app on your Mac, choose View > Show All Devices.
Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).
In the sidebar, select a disk or volume, then click the First Aid button .
If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
Click Run, then click Continue.
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.
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.
USB flash drives can become corrupt or damaged for a variety of reasons. Luckily you can fix your USB for free. Windows chkdsk and Windows disk error checking are able to repair errors on your disk from the command line. Afterward, with EaseUS data recovery software, you can get your data back from a failed pen drive without losing files.
The Problem: Corrupted USB Pen Drive Repair Overview
USB flash drives, pen drives, thumb drives can easily get corrupted or result in device failure due to a virus attack, file system corruption, hardware malfunction, improper shutdown, and more.
When it happens, you have to repair the corrupted USB flash drive or pen drive to make the device work normally again.
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However important, the method to actually repair a corrupted USB flash drive or pen drive is often a headache for users who don't want to lose data on their device. If the data is not of consequence, formatting the device will usually be a sufficient fix.
Fortunately, via the combination of a built-in Windows disk repair tool and a third-party USB flash/pen drive data recovery software, you can repair a failed pen drive for free and recover all lost data.
The Tools: Download Free USB Repair Utility & Data Recovery Software
When you search 'USB flash repair software' or 'pen drive repair software' on Google, a huge number of hard drive repair tools advertise to be able to repair pen drives and recover data. But few of them actually work as well as they advertise.
Using Flash Drive On Mac
Most software can only scan or find some existing data on the corrupted device. To fully resolve the USB corrupt error, you'll need more than just third-party repair software.
Corrupted USB Repair Tools: No matter how your USB flash drive or pen drive became corrupted or failed, USB repair software combining with data recovery software will help.
- # First: Use the Windows disk check tool to repair the device.
- CHKDSK command line and Windows disk error checking can both work for repairing a corrupted storage device.
- # Next: Download powerful data recovery software to get all of your data back.
- EaseUS Data Recovery Wizard can restore all lost files from corrupted USB or pen drive in 3 steps.
Damaged USB Repair Solution: If your USB or pen drive gets physically damaged or broken, take your USB to a local external device repair center or a manual data recovery service shop for help.
The Procedure: Repair a Corrupted/Failed USB without Data Loss
Before you start, check if your corrupted USB or pen drive can be detected by Windows PC:
- If yes, move on and repair it immediately.
- If not, you can refer to USB not showing up or USB not recognized to find more solutions.
The first step is to check the disk and repair its errors. Afterward, use data recovery software to recover any missing or inaccessible data.
#1. Run USB repair tool - CHKDSK utility to fix corrupted USB or pen drive
To repair the USB drive we will use the chkdsk utility within Command Prompt. There is also an alternative that does not use the command line that is shown below.
- Step 1: Insert the corrupted USB or pen drive to the USB port on your PC.
- Step 2: Go to the search bar and type: cmd, hit Enter.
- Step 3: Click cmd.exe and open Command Prompt as Administrator. (Sign in as Administrator with your account if the program asks for permission).
- Step 4: Enter: chkdsk j: /f /x
Replace j: with the drive letter of your USB drive.
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- Syntax note
- j: -- The drive letter. Replace with the letter of your USB drive
- /f -- Will attempt to fix any errors on the disk
- /x -- Will force the USB drive to be dismounted before initiating the scan
- /r -- Will scan for and attempt recovery of bad sectors. It will take a longer time to scan the sectors and is optional, but it might be worth checking for bad sectors if your device is having issues
If you decide to use it, enter: chkdsk j: /f /r /x
CHKDSK alternative - repair corrupted file system on USB
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.
CHKDSK alternative - check disk with Error Checking
You may also do this same task using the Error-checking in the device properties menu. It can be more intuitive if you are not very comfortable with the command-line syntax. For Windows 10:
- Step 1: Insert the corrupted USB to your PC via the USB port.
Go to File Explorer > This PC.
- Step 2: Right-click on the USB device, select Properties.
- Step 3: Go to Tools, click the Check button under Error checking.
- Step 4: Select Scan and repair drive.
- Step 5: Continue to follow the wizard interface, it will prompt you to automatically fix disk errors if any are detected.
# 2. Recover data after repairing corrupted USB flash/pen drive
EaseUS file recovery software - Data Recovery Wizard is 100% secure. With this software, you can get everything back with no limitation.
It supports USB pen drive, flash drive or other removable storage devices of all major brands such as Sony, Transcend, SanDisk, Kingston, Apacer, Panasonic, PQI, Toshiba, Super Flash, and Ridata.
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EaseUS Data Recovery Wizard is incredibly simple to use. The steps to recover data from a USB drive are as follows:
Step 1. Run USB data recovery software.
Connect the USB flash drive to your computer and launch EaseUS USB data recovery software on your PC. Select your USB drive which marks as a removable disk, and click 'Scan' to start finding your lost files.
Step 2. Scan all lost files from USB.
EaseUS Data Recovery Wizard will thoroughly scan your USB flash drive and find all your lost data on it. After the scanning process, use the Filter feature to filter a specific file type. You can check and preview found USB files in this program.
Step 3. Restore all lost files from USB.
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A double-click will allow you to preview the file results. Choose the target files and click 'Recover' to save them to a secure location on your PC or other external storage devices.
Notice: When restoring data from the USB or pen drive, save the files to a different location than where you originally lost them.
To completely repair your USB and be certain that it is in perfect working condition after repairing it, you can back up the data to your computer, reformat the device, then restore the data.