The External hard drive can be detected but not opening, how to solve it

Summary

When the external hard drive is detected but not open on Windows PC, the proper reasons are permission, access denied, file system errors and device driver outdated. This page includes solutions on how to resolve external hard dive not detected but not opening issue without losing data by the help of EaseUS file recovery software.

My external hard drive is recognized but won't open

"Recently, I connected my 64GB external hard drive to the computer, it didn't appear as normal in the 'My Computer' folder. Instead, it shows up as an unknown device in Device Manager.

My external hard drive detected but cannot open? I have so many important files on the drive, so I can't format it unless files were safely restored. Can I fix this issue without losing my files?"

Being different from an unrecognized external hard drive, the causes of "external hard drive detected but cannot open" error seems to be more commonly discussed. Here is a list of symptoms when the external hard drive or other storage devices become inaccessible:

• Access denied
• File system error
• Storage device driver is outdated
• Device not formatted error
• Unsupported file system
• The request failed due to fatal device hardware error
• Unknown disk not initialized

The listed issues may occur to most older devices, to resolve these issues, you can follow Part 1 to restore and extract data from the device first and refer to Part 2 for specific solutions.

As for a new external hard drive, users may meet the last listed issue and they just need to initialize the device to make it accessible. 

Part 1. Restore data from not opening external hard drive (3 steps)

How are you going to access saved data on the external hard drive which is not opening on your Windows computer? Professional data recovery software - EaseUS Data Recovery Wizard to enables you to access data on an inaccessible storage device.

With it, you can fully scan and recover data from the inaccessible hard drive in 3 steps:

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 under the External Devices tab, 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 this, move on to Part 2 and find an effective solution to make the external hard drive accessible again on Windows 10, 8 or 7. 

Part 2. Fix external hard drive detected but not opening error (4 methods)

How to rectify the external hard drive detected but not opening error and make your device work perfectly again? Here, we've collected 4 reliable methods that can help:

Method 1. Gain administrator permission (3-4 minutes)

Applies to: remove device inaccessible issue without access permission

The process of getting access permission on Windows 10 and 8 are similar, only a tiny different on Windows 7 and older OS.

• Step 1: Open This PC, right-click the inaccessible external hard drive and select "Properties".
• Step 2: Go to Security, click "Advanced" and "Owner".
• Step 3: Click "Edit" and click your username under Group or username.
• 
• Step 4:Check all boxes under Allow column, click "OK" to confirm and "Apply" to keep all changes.
• 

Reboot PC and reconnect the external hard drive to your PC if necessary.

Method 2. Update the external hard drive driver (3-5 minutes)

Applies to: resolve device driver outdated, not opening issue

• Step 1: Connect the external hard drive to the PC.
• Step 2: Right-click on This PC/My Computer icon, select Manage and go to Device Manager.
• Step 3: Expand Disk drivers, find and right-click on the external hard drive, choose "Update driver".
• 
• Step 4: Select "Search automatically for updated driver software" and wait patiently till the process completes.

Reboot the PC and reconnect the device if the system requires.

Method 3. Check and fix file system errors (4-5 minutes)

Applies to: fix corrupted file system or existing errors, making device not opening

To do so, you can either use disk error checking tools or cmd command to check and fix existing file system errors on your device.

Here is the example of using CMD command to fix file system errors:

• Step 1: Press Windows + R keys simultaneously to invoke Run. Type cmd in the empty box and hit Enter.
• Step 2: Type disk part and click OK to bring it up.
• Step 3:  Type chkdsk G: /f /r /x and hit Enter. 
• Replace G with the correct drive letter of the external hard drive that is not opening.

Exit the command prompt and safely eject your external hard drive. After some seconds, try reconnecting it and see if you can open it normally.

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 to try an automatic command line alternative.

EaseUS Tool 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 Tool M for Free and install it.

Step 2: Open the software and select "File Fixing" on the left pane. 

On the right pane, choose the drive and check off the box at the bottom - "Check and fix file system error". Then, click "Fix" to start repairing the error.

Step 3: Wait until the operation completes. Wait until the operation completes. After the operation completes, click the "View" button to check the drive. 

Method 4. Format external hard drive, change file system to NTFS

Applies to: resolve unsupported, unrecognized file system causing device unopenable

Mostly, NTFS and FAT32 are the default file system of external hard drive and USB devices. Sometimes, if the operating system doesn't support a specific file system, the device will not open.

To resolve this issue, you can format the device to NTFS or FAT32 by using disk management or free format tool. Here is an example of changing external hard drive file system by using EaseUS free format tool - Partition Master Free. Only 3 steps will make it work again:

 

Step 1: Connect the external hard drive to PC. Run EaseUS Partition Master, right-click the external hard drive and choose "Format".

Step 2: Set a new Partition label, new File system (NTFS/FAT32), and Cluster size for the external hard drive, then click "OK".

Then you will see a warning window, click "OK" in it to continue.

Step 3: Click the "Execute Operation" button in the top-left corner to review the changes, then click "Apply" to start the formatting process.

Wait for the formatting process to complete. Then you can unplug and replug the external hard drive, reusing it to save files again.

To sum up, to unplug the external hard drive by using safely remove method, update disk driver timely, fixing file system error and use adaptable file system on storage devices, you can safely avoid the device is detectable but not opening issue.

Also, don't panic when you meet this issue. Turn EaseUS file recovery software to restore and export valuable files first, and then apply 4 methods on this page to make your device usable again.