If you wake up one day and find your files disappeared from external hard drive, don’t freak out… Yet. It’s a common problem that users experience due to the storage behavior of both hard drives and the operating system itself. Data loss usually occurs after memory and file system-related issues such as formatting, virus attacks, corruption, and more.

Why Files Could Disappear From an External Hard Drive

Missing files from external hard drive is often the first sign of damage or corruption (or in some cases, user error). We listed the most common reasons below:

CauseDetails
Accidental DeletionQuite obvious, but accidental deletion is one of the most common reasons for data loss. It’s fine, we won’t judge you. Good news – deleted files are often still fully intact in the file system.
Hidden FilesFiles become hidden for 2 reasons: (1) They are system files that keep Windows stable or, (2) you accidentally changed their properties. Solutions below.
Modified “CheckedValue”CheckedValue enables or disables the “Show hidden files & folders” feature. Viruses often target it so they can stay safely hidden in the file system. Solution below.
Mirror image in memory is damagedMirror images stored incremental backups for everything from user files to system folders. Data loss is inevitable if it gets damaged or corrupted.
VirusViruses can delete, hide, and corrupt files, depending on its nefarious goal. They often hide files so users can’t delete the source of the virus.
Accidental FormattingThe process of formatting wipes data from a drive. Fortunately, just like with accidental file deletion, formatted files are still living somewhere in your file system. That means you can still recover data from a formatted hard drive.
Wear and Physical DamageHard drives are particularly prone to wear and damage due to its spinning disk. In this case, it’s better to send it to a professional data recovery center to avoid making things worse.
Problems with File System IntegrityA damaged or corrupted file system may cause files disappeared from hard drive or simply go hidden. You usually fix corrupted drives by formatting them (which wipes your data). But using data recovery software, you can recover data from your external hard drive without formatting.

Can You Recover Files that Disappeared From an External Hard Drive?

External hard drives have their own “behaviors” when handling file storage. This dictates how data recovery will go. Common cases are:

Case 1: Files permanently deleted from an external drive

Yes! While external drives don’t send permanently deleted files to the recycle bin, they still exist deep within the file system. However, they’re already marked to be overwritten so saving new data to the drive may truly delete them forever.

So avoid using the drive! Fortunately, you can safely extract your files using data recovery software.

Case 2: Files missing from an external hard drive but still taking up space

Yes! There are two reasons for a mismatch of available space on an external hard drive. Either you accidentally set those files to “Hidden” or they have been permanently deleted but still temporarily reside in your drive’s file system (like we talked about in the last section).

So your files may be deleted according to the Windows interface, but space is still occupied on the drive. In either case, you can absolutely recover your missing data using the methods below.

Methods to Recover Missing Files From an External Hard Drive

Depending on why a file or folder disappeared from your external hard drive, certain methods will work better than others. But there’s no harm in trying all of them. Below are 5 different external hard drive data recovery methods that explain in simple words what problem it solves, along with step-by-step guides so you don’t get lost along the way.

Method 1: Make a Backup and Scan it With Disk Drill

If your hard drive files disappeared, you really want to avoid using that drive any more. This method allows you to fully extract your data from the drive without interacting with it. First, we want to create an “image” backup of the drive, effectively “cloning” the entire disk. Then, we can use data recovery software to scan that image (the clone of your drive’s data) and restore files that way.

For this article, we’ll be using Disk Drill. We’ve used it many times to recover large amounts of data, and it’s super easy to use – even for beginners. It’s also the tool I used to restore my Seagate drive when a bunch of my important Excel files disappeared (and my soul consequently left my body). If you want to learn more about this software, we wrote a full Disk Drill review on our blog.

Here’s what to do:

  1. Connect your external hard drive (this also works for USB flash drives) to your computer.
  2. Download and install Disk Drill, then launch it by double-clicking its icon.
  3. Click “Drive Backup” on the left sidebar. Let’s do it!
    Disk Drill bye-to-byte backup initial window
  4. Select your drive from the list and click “Byte-to-byte Backup” on the top-right corner of the screen.
    Disk Drill backup drive selection window
  5. Select a location on your computer (to avoid overwriting data on your external drive) where Disk Drill will save the backup file, then click “OK”.
    Disk Drill backup drive selection window
  6. Wait for the process to complete. Then, click “DONE”.
    Disk Drill byte-to-byte image completion confirmation window
  7. Locate the backup file and double-click it to mount it.
    Backup file in Windows documents folder
  8. Return to Disk Drill, and click “Data Recovery” on the left sidebar. You should now see your backup file listed as a drive. Select it, then click “Search for lost data”.
    Disk Drill drive selection window
  9. Wait for Disk Drill to complete its scan, then click “Review found items”.
    Disk Drill scan process
  10. Select the files you want to restore by ticking the checkboxes in the left-most column of the window. Then, click “Recover”. Or, you can leave your selection blank and click “Recover all…”.
    Dusj Drill recovery selection
  11. Select a location on your computer where Disk Drill will save the recovered files. Finally, click “OK”.
    Disk Drill save recovered files dialogue box

Method 2: Try to Unhide Files

Windows usually hides files to keep the system stable. However, users may want to access them. It may also be the case that a virus attack or drive corruption caused them to become hidden. Here are two ways to unhide them:

With Windows Explorer

You can unhide files (even system files) by changing a setting via Windows Explorer. Here’s how to do it:

  1. On Windows file explorer menu bar click View > Options > Change folder and search options.
    Windows File Explorer View Options menu
  2. Click the “View” tab, scroll down to “Advanced settings”, then select “Show hidden files, folders, and drives”. Hit “Apply”, then “OK”.
    Folder Options dialogue box

Using Windows Command Prompt (attrib)

The attrib command allows users to modify attributes on files and directories. We’re going to use it to clear the “Hidden” attribute. It’s super easy – just a single line of code. Open Command Prompt, type the following command, and press enter:

attrib -h -r -s /s /d D:\**.**

Change the drive letter (in this case “D”) to whatever letter is assigned to the drive you want to scan.

Attrib command in Command Prompt

Method 3: Change Registry Value

If you’re unable to unhide your files using the above method, a virus may have disabled your ability to change folder settings by attacking the registry. This is a common tactic viruses use to evade detection. Here’s how to fix it:

  1. Open the Registry Editor by launching the Run command (Windows + R) and typing “regedit”. Hit “OK”.
    regedit in Windows Run command
  2. On the left sidebar, navigate to (you can copy-paste it to the address bar):
    “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL”.In this window, see if “CheckedValue” is showing the number “1” in the Data column. If it is, move on to the next method. If not, proceed to step 3.
    Regedit CheckedValue parameter
  3. If the Data value of “CheckedValue” is not “1”, right-click it and hit “Delete”.
    Regedit CheckedValue right-click menu
  4. Right-click on a blank space in the window, click New > DWORD (32-bit) Value.
    Regedit new DWORD option
  5. Change “New Value #1” to  “CheckedValue” and set its Data value to “1”.

Method 4: Check the Integrity of the File System

Viruses or drive corruption can damage the integrity of the file system. This may cause files missing from hard drive, or in some cases even your external hard drive won’t show up on File Explorer. Fortunately, Windows provides native tools that can check your file system integrity and repair errors along the way.

CHKDSK

chdsk is a powerful command prompt utility that can detect, report, and even repair errors, bad sectors, and more. In some cases, it can even fix a corrupted hard drive. Here’s how to use it:

  1. Run Command Prompt as Administrator.
    Command Prompt Run as Administrator button
  2. Type the following command and hit enter:
    chkdsk

    chkdsk command in Command Prompt

Error-Checking Tool

The Error-Checking Tool also detects and attempts to repair errors on the disk. Unlike the last method, you don’t need Command Prompt to use it.

  1. On Windows file explorer, look for your drive on the left sidebar and right-click > Properties.
  2. Open the Tools tab, and click the “Check now…” button under the “Error-checking” section.
    Drive Properties dialogue box
  3. Tick the boxes beside “Automatically fix file system errors”, then click “Start”.

Method 5: Restart the Computer and Reconnect the External Hard Drive

It’s quite possible that that a corrupt mirror image or bogged down computer can greatly delay a system refresh. This can cause your files to disappear temporarily from your external hard drive. Try disconnecting your external hard drive and restarting your computer. Then, reconnect it and try to see if your files reappeared.

FAQ

Conclusion

Missing files are alarming, and unfortunately, it’s a common problem. Identifying the cause of disappearing files will make it easier to quickly find the best solution. Just make sure to handle your drive carefully, since tampering with it carelessly can make things worse!