You click Eject, ready to unplug your flash drive and move on with your life, and then Windows hits you with the digital equivalent of “not so fast”: This device is currently in use. Suddenly, a simple two-second task turns into a tiny office thriller. Is a file still open? Is File Explorer being clingy? Is your antivirus acting like an overprotective parent? Usually, the answer is yes to one of those questions.

The good news is that this error is usually fixable, and it does not always mean something is broken. In most cases, your computer is still reading from the drive, writing to it, scanning it, indexing it, backing it up, or stubbornly pretending it is doing one of those things. The trick is to identify what is holding the device hostage and then remove it safely.

In this guide, you will learn what the “This device is currently in use” message actually means, why it happens with USB sticks and external hard drives, and the best ways to fix it without risking corrupted files. We will also cover how to prevent it from happening again, because nobody wants a weekly argument with a thumb drive.

What Does “This Device Is Currently in Use” Actually Mean?

Most of the time, this message appears when you try to eject a USB flash drive, SD card reader, or external SSD/HDD, but Windows or macOS detects that something still has an active connection to the device. That “something” might be obvious, like an open video file, or sneaky, like a background sync app, antivirus scan, thumbnail generator, or backup tool.

Even if you are not actively dragging files around, the operating system may still be finishing up a write task in the background. It may also be reading metadata, building previews, syncing folders, or caching data. In plain English: your computer is not done yet, even if it looks done.

This is why simply yanking out the drive is a bad idea. When a storage device is removed before all reads and writes are complete, you risk corrupted files, damaged folders, or a drive that suddenly insists it needs repair the next time you plug it in. That is why the safest habit is still to eject first and unplug second.

Why This Error Happens So Often

This problem is common because removable storage gets used by more than one thing at a time. You may think you only opened a PDF, but your antivirus may be scanning the drive, your backup software may be checking it, Windows Search may be indexing it, and File Explorer may still be generating thumbnails for that folder full of vacation videos you meant to organize in 2024.

Here are the most common culprits:

• Open files or documents saved on the drive
• File Explorer windows still pointed at the drive
• Ongoing file copies, moves, or deletes
• Antivirus or security scans
• Backup and sync tools, including cloud apps
• Media editing software using cache files on the drive
• Windows indexing or thumbnail generation
• A background app or startup service that quietly grabbed the device

In short, the drive is usually not “broken.” It is just busy, or Windows thinks it is busy.

How to Fix “This Device Is Currently in Use”

1. Close Open Files, Folders, and Apps

Start with the obvious. Close every document, photo, video, and folder that was opened from the drive. If a File Explorer window is still displaying the contents of the USB device, close it too. This simple step solves the issue more often than people would like to admit.

Also close programs that may have touched the drive recently. That includes Word, Excel, Photoshop, Lightroom, Premiere Pro, VLC, music players, and even archive tools. Media apps are especially sneaky because they may keep a handle on files or cache locations long after you stop clicking around.

2. Wait a Minute Before Trying Again

Yes, really. Give the system 30 to 60 seconds. Large file transfers, antivirus scans, thumbnail generation, and sync tools sometimes continue after the visible progress bar disappears. Flash drives and older external hard drives can be particularly slow to finish background writes. If you copied a big folder and immediately tried to eject, the computer may still be wrapping things up behind the curtain.

This is one of the easiest fixes, and it costs exactly zero dollars.

3. Use the Right Eject Method

On Windows, try ejecting the drive from File Explorer by right-clicking the drive and selecting Eject. If that fails, use the Safely Remove Hardware and Eject Media icon in the taskbar system tray. On some systems, one method works when the other does not.

On a Mac, use Finder and click the eject icon next to the drive name, or right-click the drive and choose Eject. If a Mac says it cannot eject the disk because it is in use, that usually means an app or document is still tied to it.

4. Check for Background Sync, Backup, and Security Tools

If the error keeps returning, think about what software runs automatically on your PC. Backup programs, sync tools, and antivirus suites are frequent offenders. A portable drive plugged into a computer with auto-backup enabled may get scanned the second it appears. Cloud tools may also try to catalog folders on the device.

Temporarily pause backup software, file sync apps, and antivirus scanning, then try ejecting again. You do not need to uninstall anything. Just pause the software briefly, eject the drive, and then turn protection back on. This is especially useful when the problem happens every single time with the same drive.

5. Restart Windows Explorer

If Windows is being dramatic, restart Windows Explorer. Open Task Manager, find Windows Explorer, right-click it, and choose Restart. Your taskbar and desktop may blink for a moment. That is normal. Then try ejecting the drive again.

This works because Explorer sometimes keeps a hidden lock on removable media, particularly after browsing folders, previewing images, or opening files from the drive. It is one of the most useful fixes when everything appears closed but the device still refuses to leave the party.

6. Sign Out or Restart the Computer

If you have closed apps and the drive still will not eject, sign out of Windows and sign back in. This clears a lot of background handles without forcing you into a full troubleshooting rabbit hole.

If that still does not solve it, restart your computer. Once the PC is fully shut down, disconnect the drive. This is often the safest last-resort option if you are worried something is still accessing the device. A proper shutdown is much better than pulling the plug while the drive is active.

7. Turn Off Search Indexing on That Drive

If a particular removable drive triggers this problem over and over, Windows indexing may be part of the issue. Right-click the drive, choose Properties, and uncheck the option that allows files on the drive to have contents indexed in addition to file properties. For a drive used mainly for transport or backup, this can reduce unnecessary background activity.

This fix is not always required, but it can help with drives that are constantly being scanned for search indexing the moment they are connected.

8. Try Another USB Port or Cable

It sounds basic, but it matters. A flaky cable or unstable USB port can cause weird disconnect behavior, slow responses, and failed ejection attempts. If the drive keeps acting odd, connect it directly to a different USB port, preferably not through a hub. If it is an external hard drive or SSD with a detachable cable, test another cable too.

Sometimes the “device in use” problem is not about software at all. It is about a shaky connection that makes the system behave unpredictably.

9. Test the Drive on Another Computer

If your external drive ejects normally on another PC or Mac, that is a clue that the issue lives in your original computer, not in the drive. That usually points to background software, startup services, indexing, or a device-specific conflict on the first machine.

If the problem follows the drive to multiple computers, inspect the drive for file-system errors and back up your data as soon as possible.

10. Scan the Drive for Errors

If you have seen repeated eject failures, random disconnects, or “scan and fix” messages, run a disk check. On Windows, right-click the drive, go to Properties > Tools, and run Error Checking. This will not solve every case, but it can help if the file system has been stressed by improper removals.

Think of this as the storage equivalent of going to urgent care before the problem becomes a full-blown drama series.

Does Windows Quick Removal Mean You Can Skip Eject?

This is where things get confusing. Newer versions of Windows default many external storage devices to a setting called Quick removal. That reduces the system’s use of write caching and makes spontaneous unplugging less risky than it used to be. However, “less risky” is not the same as “always a great idea.”

If the drive is actively copying files, being scanned, or used by an app, unplugging it without ejecting can still cause problems. The safest everyday habit is still to close everything, eject the drive, wait for confirmation, and then remove it. It is boring advice, yes, but boring advice is often what saves your files.

If You See the Same Problem on a Mac

Mac users get a similar headache with “Disk not ejected properly” or warnings that a disk cannot be ejected because it is in use. The first fix is to quit the apps using the disk and close any documents stored on it. If that does not work, log out of your Mac account and back in, then try ejecting again.

If the drive still will not eject, the clean fallback is to shut down the Mac, disconnect the device, and power back on. It is not glamorous, but it is safe and effective. If another user account on the Mac is using the disk, that can also block ejection, so shared machines may need a little more detective work.

How to Prevent the Error From Happening Again

Once you fix the issue, it is worth changing a few habits so you are not trapped in this same conversation with your USB drive next week.

• Always close files before ejecting the drive
• Wait for large transfers to fully finish
• Do not keep editing apps open if their cache or project files live on the drive
• Pause backup or sync tools before removal when needed
• Avoid cheap hubs and unreliable cables
• Use eject every time, even when you are in a hurry
• Run occasional error checks if the drive has a history of improper removal

If you use an external drive for video editing, photography, music libraries, or backup archives, this matters even more. Creative apps and security tools love background access. They are productive, sure, but they are also nosy.

Conclusion

The “This device is currently in use” message is annoying, but it is usually a sign that your computer is trying to protect your data, not sabotage your afternoon. In most cases, the fix is simple: close open files, wait a moment, pause background tools, restart Explorer, or restart the computer if necessary. If the issue becomes a pattern, check indexing, backup software, cables, and the health of the drive itself.

The main rule is simple: do not force it. A few extra seconds spent ejecting a drive properly can save you from corrupted files, repair prompts, and the kind of unnecessary panic that begins with “Why are all my folders empty?” and ends with a very bad day.

In other words, treat removable storage like a houseguest. Let it leave politely before you slam the door.

Bonus: Real-World Experiences With This Error

One of the most common real-world scenarios involves people who believe they are done with a drive because the copy window disappeared. A student copies class notes to a USB stick, closes the laptop lid, and then tries to eject the drive on the way out the door. Windows says the device is still in use. What happened? Usually, the file transfer finished visually, but the system was still writing metadata or scanning the files in the background. Waiting another minute and closing the open File Explorer window often solves it. It feels silly, but it works.

Another very common experience comes from photographers and video editors. Someone finishes working in Lightroom or Premiere Pro, closes the project, and assumes the external SSD is free to go. Not quite. Creative apps often use cache files, preview files, or media databases that stay active longer than expected. In these cases, the drive is not “stuck” so much as quietly employed. Fully quitting the application, rather than just closing the project window, usually fixes the issue. Many editors learn this the hard way exactly once.

Office users run into a different version of the same problem. They open a spreadsheet from a removable drive, save it, close Excel, and still cannot eject the device. The hidden culprit might be a background backup tool, an antivirus scan, or even preview thumbnails in File Explorer. This is why the error feels so random. You can do the same action five times, and only one time will the system decide it is still “busy.” The difference is often some invisible background process that happened to wake up at the wrong moment.

Laptop users also report that the problem appears more often when they use USB hubs. A hub is convenient until it is not. If power delivery is inconsistent or the connection is flaky, Windows may hang onto the device longer than expected. Plugging the drive directly into the computer often clears up the mystery immediately. It is not the glamorous fix people hope for, but it is the kind that makes you mutter, “Seriously? That was it?”

Mac users have their own version of the same frustration. They drag a disk to the Trash, get a warning that it is in use, then spend ten minutes clicking around like the Mac offended them personally. In many cases, a document is still open, Finder is previewing the contents, or another user account has the disk active. Logging out and back in sounds old-school, but it works surprisingly well.

The biggest lesson from real experience is this: the message is usually not a disaster. It is a delay. Most of the time, your files are fine, your drive is fine, and your computer is just being overly cautious. Once you understand the usual suspects, the problem goes from scary to mildly annoying, which is a major upgrade in the world of tech support.