Fixed: A Device Which Does Not Exist Was Specified in Windows 11/10

Error: A Device Which Does Not Exist Was Specified!

You're in the middle of copying some important files to an external drive, or maybe you're just trying to open a folder on your second hard drive, when suddenly Windows throws up a message that stops you cold:

• Location is not available. H:\ is not accessible. A device which does not exist was specified.

• An unexpected error is keeping you from copying the file. If you continue receive this error, you can use the error code to search for help with this problem. Error 0x800701B1: A device which does not exist was specified.

The drive is right there, plugged in, spinning away—so why is Windows showing this error message?

This error isn't about the physical device disappearing. It's about Windows losing its communication link with the hardware. In most cases, you can fix the "A device which does not exist was specified" error without losing your data or resorting to expensive repairs.

We will show you all possible solutions, whether you're dealing with a finicky USB flash drive, an external hard drive that's gone MIA, or an internal SSD that's suddenly acting up, we've got you covered. Check them now.

Why Does Windows Show "A Device Which Does Not Exist Was Specified" Error?

The drive remains physically connected, but the data path has been interrupted, causing the error. This failure can occur for several distinct reasons:

• Physical component failure: The internal read/write heads or the controller chip on the drive's circuit board may have stopped functioning.
• Power problems: External drives, particularly larger models, may trigger this error when they receive insufficient steady voltage to maintain operation.
• Faulty bridge chips: In external enclosures, the chip that converts SATA to USB can fail—the computer detects the bridge but cannot reach the actual drive.
• Loose or damaged cables: A compromised SATA cable or unstable USB connection can cause intermittent disruptions that produce this exact message.
• Driver issues: Outdated or corrupted drivers can interrupt proper communication channels.
• Bad sectors: Physical damage to portions of the drive can render certain areas inaccessible.
• Permission problems: Your user account may lack full control over the drive.

This error can appear in various contexts—when initializing a new disk, copying files, or simply attempting to open a folder.

Recover Important Files Before Fixing

If your device can be detected in Disk Management, you can try the powerful Windows data recovery software, MyRecover, to recover files fast and easily. With MyRecover, you can enjoy the following benefits:

• Bypasses File System Corruption. The error often stems from corrupted file systems. MyRecover supports NTFS, FAT, FAT32, and ReFS, scanning drives at a low level regardless of file system damage.
• Two Powerful Scanning Modes. Quick Scan finds recently deleted files, while Deep Scan performs sector-by-sector analysis to locate data from formatted, corrupted, or severely damaged drives.
• Preview Before Recovery. You can preview recoverable files—photos, documents, videos—before committing to restoration. This confirms file integrity and ensures you're recovering the right versions.
• Handles Multiple Failure Scenarios. MyRecover addresses various causes of device errors: accidental deletion, formatting errors, partition loss, virus attacks, and system crashes.
• Fast Recovery with High Success Rate (99%). The software quickly identifies and restores lost files.

Here's a step-by-step guide to using MyRecover to rescue your data before you attempt any repairs:

1. Install MyRecover and launch it. Connect the problematic drive to your computer.

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2. Tap Disk Data Recovery, choose the problematic drive, and hit Scan. Hit OK when it's done.

3. Preview and select the files you need, and hit Recover.

4. Choose a safe location to keep them.

Notes:✎...

Once the scan completes, you'll see a list of recoverable files organized by file type. You can tap Path to find files by folder structure. Use the filter and search functions to find specific files. 

Double-click a file to preview it and confirm it's intact and the right version. 

You can also create a bootable media to boot up a crashed computer and recover files easily. 

You can recover unlimited files at a time after upgrading to MyRecover Professional or Technician.

With your data securely recovered, you can now attempt more aggressive fixes on the original drive without fear of losing everything.

MyRecover

• Recover Deleted Files Easily with Simple Clicks   
• 1000+ File Formats Supported   
• Support HDD, SSD, External Hard Drive, USB Drive, SD Card, etc.   
• Quickly Find Files Using File Types, Name, Size, etc.
• Preview Files Before Recovering
• Recover Unlimited Data

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Fix A Device Which Does Not Exist Was Specified | 6 Ways

Critical point to remember: if important data resides on that drive, proceed carefully. Some solutions require formatting or making changes that could erase your files. We'll address data recovery first, then move on to the fixes.

There are different solutions you can try to fix the error: A device which does not exist was specified. Check them now.

Solution 1. Verify Physical Connections and External Devices

A loose connection is the main cause.

First, try a different USB port—especially one directly on the motherboard rather than a front-panel port or a hub. Front ports can sometimes be underpowered or have flaky connections.

Next, check the cable. If you've got a spare, swap it out. Damaged cables are notorious for causing intermittent connection drops that trigger the "device does not exist" message. For external drives, make sure they're getting enough juice. Some larger desktop external drives need their own power supply.

If you're comfortable with this sort of thing, you might even try removing the drive from its enclosure and connecting it directly via SATA. But only do this if you know what you're doing.

Solution 2. Check Disk Management for Drive Recognition

Pop open Disk Management and see what's what.

1 Right-click the Start button and select "Disk Management" from the menu.

2. Look for your problematic drive. Does it show up at all? If it does, check its status:

• If it says "Unallocated" or "Not Initialized", don't click anything yet—especially don't format or initialize if you need the data.
• If it shows as "Online" but without a drive letter, that's a good sign.
• If it's not showing at all, we've got more work to do.

While you're in Disk Management, try this: click the "Action" menu at the top and select "Rescan Disks". This forces Windows to go hunting for hardware changes and can sometimes re-establish a lost connection with a drive that's dropped off the radar.

Solution 3. Run Windows Update for Driver Fixes

Sometimes the fix is as simple as letting Windows update itself. Microsoft regularly pushes out driver updates through Windows Update. Head to Settings > Windows Update and check for any pending updates. Install them, reboot, and see if your drive wakes up.

Solution 4. Run DiskPart to Format the Device (Lose Data)

If you need to fix a device that was not specified using the command prompt. DiskPart is your option.

1. Press the Windows key, type "cmd", right-click Command Prompt, and select "Run as administrator". Click Yes when prompted.

2. Type diskpart and press Enter.

3. Then type list disk and press Enter to see all connected storage devices. Identify your problematic drive by size and note its disk number (Disk 1, Disk 2, etc.).

4. Type select disk X (replace X with your disk number) and press Enter. You'll see "Disk X is now the selected disk".

5. Type clean and press Enter to remove all partitions and volume formatting.

6. Type create partition primary and press Enter.

7. Then, type select partition 1, and hit Enter. Then input active to run.

8. Input format fs=ntfs quick and press Enter for quick NTFS formatting.

8. Type assign letter=G (or any available letter) and press Enter. Type exit to close DiskPart.

Solution 5. Update Storage Controllers in Device Manager

Outdated or corrupted storage controller drivers can absolutely cause the "A device which does not exist was specified" in Windows 11/10 headache, especially when you are initializing the disk.

1. Open Device Manager (right-click Start and select it).

2. Expand "Storage controllers", and look for any controllers with yellow exclamation marks.

3. Right-click each one and select "Update driver".

update-drivers-storage-controller.png

4 Choose "Search automatically for updated driver software" and let Windows do its thing.

Solution 6. Perform System File Checker and DISM Scans

Corrupted system files can cause all kinds of weird behavior, including storage errors. So you can run SFC and DISM commands to fix the errors (corrupted system files and bad sectors, etc).

1. Open Command Prompt as admin and run the Deployment Imaging Service and Management Tool:

DISM /Online /Cleanup-Image /RestoreHealth

This repairs the Windows system image itself. Reboot after both scans are complete and check if your drive is accessible.

2. Then run the following command:

sfc /scannow

This will scan all protected system files and replace corrupted ones with cached copies. Let it run—it might take a while.

Fix "A Device Which Does Not Exist Was Specified" When Copying

Sometimes the error only shows up when you're trying to copy files. This is especially common when copying to or from USB drives. So, try the following solutions:

Way 1. Clear File Explorer Cache and History

File Explorer caches all sorts of information about your drives and folders, and sometimes that cache gets corrupted. Clearing it out can help.

1. Open File Explorer Options (search for it in the Start menu).

2. Under the General tab, click "Clear" next to "Clear File Explorer history".

3. While you're there, switch to the View tab and check "Show hidden files, folders, and drives" if it's not already enabled.

Way 2. Check Destination Drive Permissions

Permission issues can absolutely trigger this error. Here's how to make sure you've got full control:

1. Right-click the problematic drive in File Explorer and select "Properties".

2. Go to the "Security" tab and click "Edit" to change permissions.

3. Select your user account from the list, and under "Permissions for", make sure "Full Control" is checked under the Allow column. Click Apply and OK.

If your account isn't listed, you can add it by clicking "Add", typing your username, and then granting full control.

Way 3. Try Robocopy as an Alternative Copy Method

Sometimes the built-in copy just won't cut it. Enter Robocopy (Robust File Copy), a command-line tool that's built into Windows and handles errors way better than the regular copy. Open Command Prompt as admin and use a command like:

robocopy D:\source E:\destination /E /COPY:DAT /R:3 /W:10

This copies everything from D:\source to E:\destination, including subdirectories (/E), copies data and attributes (/COPY:DAT), retries 3 times on failure (/R:3), and waits 10 seconds between retries (/W:10). Robocopy is a beast—it'll keep plugging away when regular copy would've given up.

FAQs About A Device Which Does Not Exist

Can I recover permanently deleted files from a drive showing this error?

A:  Yes, in many cases. The error means Windows can't access the drive normally, not that files are gone. Data recovery software like MyRecover can retrieve files from drives that Windows won't recognize. Stop using the drive immediately and run recovery software before attempting fixes that write to the drive.

Does this error mean my hard drive is dead?

A:  Not necessarily. It often stems from driver problems, loose connections, or partition corruption rather than hardware failure. Try software fixes first—they work in most cases. Worry about dead hardware only after exhausting other options.

How do I fix this error for my D drive specifically?

A:  Try these steps in order: check connections (reseat SATA cable if internal), update storage controllers in Device Manager, run chkdsk D: /f from an admin command prompt, and check Security tab permissions. If nothing works, use data recovery software first, then consider reformatting.

What is error code 0x800701b1, and how is it related?

A:  Error 0x800701b1 is the technical code for "a device which does not exist was specified".It indicates Windows lost communication with the device during data transfer. The same fixes resolve both errors: try different USB ports, check cables, update drivers, or use Robocopy instead of standard Windows copy.

How do I fix Windows' inability to install an unknown device?

A:  Open Device Manager, find the unknown device under "Other devices", right-click Properties, go to Details tab, and select "Hardware Ids" under Property. Copy the displayed value to identify the device, search online for drivers using that hardware ID, and download and install them. If still failing, temporarily disable driver signature enforcement.