Plug in one end of the USB cable into the USB device. Plug in the other end of the USB cable into the computer. Connect the USB device into your computer. If your Mac does not detect the device when plugged in, plug the device into a different USB port to see if it's able to recognize it. Nov 17, 2019 Step 3: To check whether your Mac has booted into Safe Mode, click on the Apple logo on the top left and then on About this Mac. In the window that opens, click on System Report You should be able to see this: How to Fix Mac Won't Boot from USB Drive. Sometimes Mac won't boot from USB.
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Summary
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.
PAGE CONTENT:
- Corrupted USB Flash Drive Repair Overview
- Download Free USB Repair Tool
- How to Repair a USB Flash Drive
The Problem: Corrupted USB Flash 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. However, the method to 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/USB 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 Tool & Data Recovery Software
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When you search 'USB flash repair software' or 'pen drive repair software' on Google, a massive number of hard drive repair tools advertise to repair pen drives and recover data. But few of them work as well as they advertise.
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 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 flash drive 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.
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 the 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< /p>
- Replace j: with the drive letter of your USB drive.
- 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 Flash Drive
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 USB Flash Drive 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 error is detected.
2. Recover Data After Repairing Corrupted USB Flash Drive/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.
![App App](/uploads/1/2/6/2/126241834/805154608.jpg)
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.
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.
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- Notice:
- When restoring data from the USB or pen drive, save the files to a different location than where you originally lost them.
To thoroughly repair your USB and be sure that it is in perfect working condition after fixing it, you can back up the data to your computer, reform the device, and restore it.
Conclusion
For software or driver issues, you can scan and repair a flash drive using your computer's built-in repair utility. If you lost data after USB corruption, you could use EaseUS data recovery software. This data recovery software can easily retrieve lost files from corrupted flash drive, SD card, hard drive, and external hard drive. Download EaseUS USB data recovery software and get back data with ease.
USB Flash Drive Repair Frequently Asked Questions
You have learned about the best USB repair tool to fix a corrupted or damaged USB drive. And always keep your data safe before repairing the USB drive. However, not all of the USB repair tools and solutions are reliable. If you still have problems, read the following questions and answers.
Can you fix the corrupted USB drive?
Yes. You can fix a corrupted USB using CHKDSK. Here are the steps:
Step 1. Plugin your USB flash drive or pen drive to your computer.
Step 2. Go to the start menu, type in 'cmd' in the search bar, hit enter, and then see something named 'cmd. exe' in a list of programs.
Step 3. Right-click 'cmd. exe', run as administrator, and type 'chkdsk /X /f G:' or 'chkdsk G: /f' (replace G: with the drive letter corresponding to your USB drive). The chkdsk operation will then start to repair the damaged USB drive.
How do you fix an unrecognized USB flash drive?
There are several ways to fix an unrecognized USB drive. Here are the methods:
- 1. Recover files and format RAW USB
- 2. Update unallocated USB drivers and create a new volume
- 3. Change the USB drive letter
- 4. Check USB port, change the USB connection
- 5. If none of the above fixes work, take USB to a local device repair center for manual repair
Why is the USB drive corrupted?
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The USB storage media is prone to be corrupted/damaged due to the following reasons:
- Virus attack
- Abrupt removal
- Sudden power outage and more
Why can't I see my USB drive in Windows 10?
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If there is something wrong with your USB driver, the USB flash drive will not appear in Windows 10 File Explorer and may show up as unallocated space under Disk Management.
Every operating system can crash at one time or another. While it's safe to say that macOS is more stable than Windows, it can still be affected by issues that prevent your computer from booting up. In such cases, you might need to boot your Mac from a USB flash drive to fix the problem. This article shows you two ways to boot Mac from external USB stick, as well as some troubleshooting tips in case Mac won't boot from the target USB.
Boot Mac from USB Option l: Startup Manager
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If your Mac won't boot up normally, you can set it to boot from a different drive, such as a USB stick containing macOS installation files in bootable format. The drive will have to contain a version of the OS that is compatible with the Mac. As long as you have the bootable installation USB, you can start your Mac from the USB by accessing the Startup Manager. Here are the steps to be followed:
Step 1: Insert the bootable USB into Mac and power it on.
Step 2: As soon as the startup process begins, hold down the Option (alt) key and keep it depressed until you see the Startup Manager on your screen. If there is a firmware password on your Mac, hold down the Option key until you're asked to enter that password.
Step 3: You will now see the various startup disk options, and your USB will be listed there. If you click on the Up arrow right below the icon for the USB, the computer will only startup once using this disk. If you press and hold down the Control key while making your selection, it will be saved, and your computer will boot from the USB every time, as long as it is left in the computer.
At this point, you can also use the Mac installation disk to boot your Mac from. It will appear as EFI Boot, and it works on all computers running macOS 10.9 or higher.
Boot Mac from USB Option 2: Safe Mode/Recovery Mode
As an alternative, you can start your Mac in Safe Mode (Recovery Mode). This will allow the system to automatically detect and repair directory issues. Safe Mode will only allow required kernel extensions to load, preventing login items and startup items to load automatically. It can also help you isolate the issue depending on whether or not the issue goes away in Safe Mode. If the issues you have during normal startup don't show up in safe mode, they are most likely fixed. That means you can reboot normally and your system should be back to normal.
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Step 1: Start your Mac and hold down the Shift key. You will see the Apple logo on your screen.
Step 2: When you see the login screen, you can release the Shift key and login to your Mac.
Step 3: To check whether your Mac has booted into Safe Mode, click on the Apple logo on the top left and then on About this Mac. In the window that opens, click on System Report… You should be able to see this:
How to Fix Mac Won't Boot from USB Drive
Sometimes Mac won't boot from USB as expected. If you are unable to select a different startup disk, it's possible that your disk is not showing up in Startup Manager. If you try Method 1 above but don't see your USB drive listed there, it could mean one of the following problems:
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Compatibility: It is possible that the version of macOS or Mac OS X that you have on the USB drive is not compatible with the hardware. That means you won't be able to see it in the Startup Manager so, of course, you won't be able to boot from it. In such cases, you may need to burn a compatible macOS version on USB drive in order to be able to boot Mac from it.
Startup Security Utility: In certain cases where your Mac has the Apple T2 Security Chip (2018 and later devices), it may be your Startup Security Utility settings that are preventing you from booting from USB. In this situation, restart your Mac and hold down the Command + R keys when you see the Apple logo. This will put your Mac into Recovery mode. In macOS Utilities, go to Utilities >Startup Security Utility and sign in as admin. Under External Boot, select the second option - Allow Booting from External Media.
Option ROM Firmware: Another known issue is that Option ROM firmware will not load in Startup Manager until you press certain keys manually. To do this, use Method 1 to access Startup Manager. Once you are there, press Option-Shift-Command-Period. You should now be able to see the USB drive. This is not exactly a problem as much as a feature. If the USB contains Option ROM firmware, you will need to press those keys everytime to boot from your pen drive.
These two methods and the troubleshooting tips should allow you to boot from USB or in Safe Mode so you can then isolate the problem that's preventing your Mac from booting up normally.