If a USB drive doesn’t show up in File Explorer, first plug it into a different USB port, ideally one on the back of a desktop PC, and try another cable if it uses one. If Windows still doesn’t show it, open Disk Management. A drive that appears there without a drive letter is the most common cause, and you can fix it in a minute.
This guide covers Windows 11 (the steps are the same in Windows 10) and follows Microsoft’s Disk Management guide and Device Manager driver guide, checked in October 2026. Work through the sections in order; the early steps are quick and safe, and the last ones can erase data.
Step 1: Quick Checks
- Try a different USB port. Front-panel ports and hubs sometimes do not supply enough power. Plug directly into a port on the computer, ideally on the back of a desktop.
- Try a different cable if it is an external hard drive or SSD.
- Test the drive on another computer. If it does not work anywhere, the drive itself may have failed.
- Unplug other USB devices in case of a power or port conflict.
- Restart the PC with the drive unplugged, then plug it back in.
- Listen and look. A drive light or a Windows connection sound means the PC sees something, which points to a software fix.
Step 2: Find the Drive in Disk Management
- Right-click the Start button and select Disk Management. You can also press Windows + R, type
diskmgmt.msc, and select OK. - Look in the lower half of the window for your USB drive. It is often labeled Removable, and its size should match the drive.
- Check how it is listed and use the matching fix below.
| What you see | What it means and what to do |
|---|---|
| A partition with no drive letter | Windows sees the drive but has not assigned a letter. Add one (next section). |
| Offline | Right-click the disk and select Online. |
| Not Initialized | May be a new disk, corrupted layout or hardware problem. Initialize only a confirmed empty disk; recover important old files first. Some USB devices do not support initialization. |
| Unallocated | Windows sees no allocated volume here. Create a volume only on space you know is empty; do not do this when recovering old files. |
| RAW | The file system is damaged or unknown. Try to recover files before formatting. |
| Not listed at all | Windows does not detect the drive. Move on to Device Manager. |
Assign a drive letter
- Right-click the drive’s partition and select Change Drive Letter and Paths.
- Select Add (or Change if a letter exists but conflicts with a network drive), pick a letter, and select OK. Result: the drive appears under This PC in File Explorer.
Create a new volume on unallocated space
Before creating a volume: confirm that the disk is new and empty. If it held files you need, stop and plan recovery; initialization, volume creation and formatting can destroy data. For a new blank SSD or hard drive, follow our Windows 11 disk initialization and volume setup guide.
Right-click the unallocated area, select New Simple Volume, and follow the wizard: accept the maximum size, pick a drive letter, and choose a format. Microsoft notes you must be signed in as an administrator. For a flash drive you will use on other devices, see how to format a USB drive to FAT32.
Step 3: Reinstall the Drive in Device Manager
- Right-click Start and select Device Manager.
- Expand Disk drives or Universal Serial Bus controllers.
- Right-click the USB drive, or any device with a yellow warning icon, and select Uninstall device, then confirm with Uninstall.
- Unplug the drive and restart the PC. Result: Windows reinstalls the driver when you plug the drive back in.
If the driver does not come back, right-click the device and select Update driver > Search automatically for drivers. Microsoft says the best way to get drivers is Windows Update, so also check Settings > Windows Update > Advanced options > Optional updates. For USB controller drivers, your PC maker’s support site is another source.
Step 4: Stop Windows From Turning Off the USB Port
If the drive appears and then disconnects, Windows power saving may be cutting power to the port. Open advanced power settings, expand USB settings > USB selective suspend setting, and set it to Disabled. Avoid unpowered USB hubs for external hard drives, which need more power than flash drives.
Step 5: Repair or Format the Drive
If the drive shows a letter but will not open, or File Explorer says it needs to be formatted, try a repair first. In File Explorer, right-click the drive, select Properties > Tools, and under Error checking select Check. If that fails and the files do not matter, format it: right-click the volume in Disk Management and select Format.
Warning: formatting destroys the data on the drive. If the files are important, use data recovery software or a recovery service first. Microsoft notes that a quick format only creates a new file table, while a full format erases the data.
Other Things That Can Hide a Drive
- Encryption: a BitLocker-encrypted drive asks for its password or recovery key before it opens.
- Work or school PCs: your organization may block USB storage. Ask your IT department.
- Mac-formatted drives: drives formatted for a Mac (APFS or Mac OS Extended) can show up in Disk Management but not open in Windows. Back up the files on a Mac before reformatting.
Frequently Asked Questions
Where does a USB drive appear when it works?
Under This PC in File Explorer. See how to open a USB drive on Windows 11.
Can I recover files from a RAW drive?
Sometimes, with recovery software. Do not format the drive first if the files matter.
Why does the drive disconnect randomly?
Usually power saving or an unpowered hub. Turn off USB selective suspend and plug the drive directly into the PC.
Why does the drive show up on another PC but not mine?
That points to a port, driver, or drive letter problem on your PC rather than a failed drive. Work through Steps 2 to 4.
Once the drive shows up, see how to put files on a flash drive in Windows.
Matthew Burleigh has been writing tech tutorials since 2008. His writing has appeared on dozens of different websites and been read hundreds of millions of times.
After receiving his Bachelor’s and Master’s degrees in Computer Science he spent several years working in IT management for small businesses. However, he now works full time writing content online and creating websites.
His main writing topics include iPhones, Microsoft Office, Google Apps, Android, and Photoshop, but he has also written about many other tech topics as well.