How to Repair External Drive Error 65535 and Recover Lost Data

What Is External Drive File System Error 65535?

External drive file system error 65535 is a Windows disk error that occurs when the operating system cannot properly read or access an external hard drive, USB flash drive, or SSD.

This error may cause:

• The external drive becomes inaccessible
• Files cannot be copied or opened
• The drive appears as RAW
• Windows asks you to format the disk
• System freezing or crashing

When this error occurs, you may notice the following signs:

• The error message file system error 65535 pops up when trying to access the external hard drive.
• Unable to create, modify, or save files to the external hard drive.
• The computer runs slowly, freezes, or crashes when the external hard drive is connected.

Fortunately, you can usually fix file system error 65535 using CHKDSK, SFC, disk repair tools, driver updates, or formatting.

Several factors may trigger this error:

• Corrupted file system
• Bad sectors on the drive
• Sudden power loss or unsafe removal
• Virus or malware infection
• Corrupted system files
• Outdated or faulty disk drivers
• Hardware connection issues

Understanding the root cause helps you choose the right repair method.

A Comprehensive Guide to Using an External Hard Drive

Learn how to use an external hard drive on Windows step by step. This guide covers setup, formatting, data transfer, backups, and drive maintenance.

Read More

Recover Data Before You Fix the Error

Before applying advanced repair methods, recovering important files from the external drive is strongly recommended.

Some repair operations, such as formatting, may erase existing data. Recovering files first minimizes the risk of permanent data loss.

MiniTool Partition Wizard includes a Data Recovery feature that can scan inaccessible external drives and restore lost files.

Here are the steps:

MiniTool Partition Wizard DemoClick to Download100%Clean & Safe

Step 1: Select the external drive to Scan.

• Launch MiniTool Partition Wizard.
• Click Data Recovery.
• Locate the external drive under Logical Drives. Then, select it and click the Scan button.

Step 2: Find specific files using Path, Type, Filter, and Search options.

• After the scan is complete, you can begin searching for files to recover.
• By default, you can expand the folders and subfolders under Path to find and select the files you want to recover.

Step 3: Save the file in a secure location.

• Click the Save button in the lower-right corner.
• Select a directory to save the selected file. It is recommended to save the recovered file on a different drive. Otherwise, the lost/deleted data may be overwritten.

How to Fix the External Drive File System Error 65535

It can be frustrating to encounter the external drive file system error 65535 in Windows.

Don’t worry, the following section will provide you with several effective ways to fix the problem.

Fix 1: Boot into Safe Mode

Booting into Safe Mode to try and resolve the external drive file system 65535 error is a great way to troubleshoot or fix the issue in a cleaner, less disruptive environment.

Step 1: Click on the Start button.

Step 2: Click on the Power icon, and hold down the Shift key on your keyboard. Then click Restart.

Step 3: Select Troubleshoot.

Step 4: Select Advanced options.

Step 5: Select Startup Settings.

Step 6: Click Restart.

Step 7: After the restart, you’ll see a list of options. Press F4 to start your computer in Safe Mode.

If the error message does not appear in safe mode, the device itself may not be completely damaged.

The problem may be that certain drivers, background services, or security software running in normal mode are conflicting with the driver, causing abnormal file system errors.

Then you can try to solve the problem in normal mode.

Fix 2: Try Basic Troubleshooting Methods

Sometimes, this error is caused by a basic problem that can be fixed with basic troubleshooting.

You can try the following simple steps:

1. Test a different USB port and cable: Sometimes, a poor connection can cause this error. Try plugging the drive into a different USB port or changing the cable.
2. Try a different computer: Try connecting the drive to another computer to determine if the problem is with your current computer.
3. Restart your computer: Some temporary errors can be easily resolved by restarting your computer.

Fix 3: Run System File Checker (SFC) and DISM

SFC is a built-in tool provided by Windows that is used to scan and repair possible damaged or missing files on the system.

Step 1: Type cmd in the Search box and click Run as administrator from the right panel. Then click Yes.

Step 2: Type the command sfc /scannow and press the Enter key.

If the above commands fail to repair certain system files, you can use DISM.exe /Online /Cleanup-Image /RestoreHealth to further repair deeper system problems in Windows.

Fix 4: Run the CHKDSK Utility

The chkdsk tool included with Windows is a command-line utility used to detect and repair file system errors and mask bad sectors on a hard drive.

Way 1: Use the CHKDSK Utility

Step 1: Type CMD in the Windows search box and choose Run as an administrator from the right side.

Step 2: Type chkdsk *: /f /r /x (replace * with the drive letter of your external drive) and press Enter.

• /f: Fixes errors on the disk.
• /r: Locates bad sectors and recovers readable information.
• /x: Forces the volume to dismount first if necessary.

Way 2: Use MiniTool Partition Wizard

MiniTool Partition Wizard offers two useful tools for detecting and repairing disk issues: Check File System and Surface Test.

If you suspect your external drive has errors, you can use this software to scan and fix them.

MiniTool Partition Wizard FreeClick to Download100%Clean & Safe

Step 1: Choose Check File System.

1. Launch MiniTool Partition Wizard.
2. Select the target partition.
3. Choose Check File System.

Step 2: Choose Check & fix detected errors.

1. On the pop-up window, choose Check & fix detected errors.

• Check only: The software will only scan the drive for issues, but will not repair them during the process.
• Check & fix detected errors: The software will scan and fix any detected errors automatically.

2. Click the Start button.

By reading sector data, the surface test function of MiniTool Partition Wizard can check whether each sector is normal.

• Open software.
• Right-click the external drive and choose Surface Test.
• Click Start Now.
• After scanning, undamaged blocks are green and damaged ones are red.

Fix 5: Format External Hard Drive

If you have successfully recovered your data but the drive still does not work properly, formatting is usually a last resort.

Please note that this will delete all data on the drive.

Way 1: Via Disk Management

Step 1: Right-click the Start menu and select Disk Management.

Step 2: Right-click the external hard drive and select Format.

Step 3: In the pop-up window, select NTFS from the File system drop-down menu and click on OK.

Step 4: Then click on OK to execute the change.

Way 2: Via MiniTool Partition Wizard

Step 1: Run MiniTool Partition Wizard to enter its main interface.

Step 2: Right-click the external hard drive and choose Format.

Step 3: In the pop-up Format Partition window, make sure NTFS is selected and press the OK button.

Step 4: Click Apply > OK.

Fix 6: Update Windows

You can try updating Windows to fix this file system error. Here is the guide:

Step 1: Click the Start icon and choose Settings.

Step 2: Select Windows Update.

Step 3: Click Check for updates and follow the on-screen instructions.

Restart your computer to see if the issue is resolved.

Fix 7: Run Disk Cleanup

Windows includes a built-in disk checking utility, Disk Cleanup. It can delete junk files that might be causing the error. To run Disk Cleanup, here are the steps:

1. Open File Explorer.
2. Right-click the external drive.
3. Select Properties.
4. Go to the Tools tab.
5. Click Check.

Then it will scan and repair detected errors.

Fix 8: Update Disk Drivers

Outdated drivers can cause various issues, including the file system error 65535 on your external hard drive.

To fix this, you can try updating the relevant drivers to fix the error.

Step 1: Press Windows + X to open the menu and select Device Manager.

Step 2: Double-click the Disk drives category to expand it.

Step 3: Right-click your graphics driver and choose Update driver.

Step 4: Choose Search automatically for drivers.

Updating your disk driver can help fix compatibility or stability issues that may cause the 65535 error on your external drive.

If the problem persists, try the following solutions.

Fix 9: Perform a System Restore

If this error occurred after you recently installed software or modified system settings, you can try using System Restore to restore your computer to its pre-error state.

Step 1: Type Create a restore point in the search box and click Open.

Step 2: Click the System Restore button and Next to begin the restore process.

Step 3: Select the desired restore point from the list.

Step 4: Select the Scan for affected programs option to see a list of programs and drivers that will be installed or uninstalled with the restore point.

Step 5: Click Next and then Finish to confirm your choice.

Step 6: Choose Yes on the final prompt to start the System Restore process.

After performing a system restore, your computer returns to its normal state before the error occurred, thus resolving the issue.

Fix 10: Scan for Viruses

Viruses and malware can cause an external drive file system error 65535. You can resolve this issue by running a Windows Defender scan and removing harmful files.

Here are the steps:

Step 1: Click the Start icon and choose Settings.

Step 2: Click Privacy & security > Virus & threat protection > Scan options.

Step 3: Tap Full scan > Scan now button, and then Windows Defender will start to scan your PC.

Removing viruses or malicious programs can help resolve the external drive file system error 65535 in Windows.

Fix 11: Disable Startup Programs

Certain third-party applications that run at system startup (such as antivirus software, backup tools, etc.) may interfere with the normal operation of the external hard drive and cause file system error 65535 to appear.

You can fix this error by disabling startup programs.

Step 1: Right-click the Start button and choose Task Manager from the menu.

Step 2: Click on the Startup apps tab.

Step 3: Find the application you want to prevent from starting automatically, right-click it, and select Disable.

Disabling some startup programs may help you locate and resolve the error.

How to fix the external drive file system error 65535 in Windows? If you are also troubled by system error 65535, don’t worry. This post provides several effective troubleshooting methods. Read them now!Click to Tweet

Bottom Line

What should I do if I encounter file system error 65535 on an external drive? To avoid data loss, we recommend recovering data first and restoring important data before attempting a repair.

Next, you can run the CHKDSK tool to check the disk. If the problem persists, you can try disabling startup items or restoring the system to its state before the error occurred. If necessary, you can also reformat the drive to a compatible file system (such as NTFS).

If you have any questions or suggestions while using MiniTool Partition Wizard, you can contact us via [email protected] to get a quick reply.

External Drive File System Error 65535 FAQ