Check the USB drive in Disk Management first; if Windows detects it but File Explorer does not, bringing it online or assigning a drive letter usually makes it appear.
1. Check the drive’s status
- Right-click Start and select Disk Management.
- Locate the USB drive by matching its capacity. Be careful not to modify the Windows system disk.
- Apply the action matching its displayed status:
- Healthy but no drive letter
- Right-click the USB partition.
- Select Change Drive Letter and Paths.
- Select Add.
- Choose an unused letter, such as
E:, and select OK. - Reopen File Explorer → This PC.
- Offline
Right-click the disk label on the left and select Online.^2^ - Not Initialized
If this is a new, empty drive, right-click it and initialize it. Do not initialize a drive containing files you need—the condition can indicate corruption or hardware trouble, and initialization may put the data at risk.^2^ - Unallocated or RAW
If the drive is empty, create a New Simple Volume or format it. Formatting and creating a new volume can erase existing data. If files are needed, stop here and use a data-recovery service or tool instead.^2^
Do not change EFI System or Recovery partitions.
2. If the USB drive is absent from Disk Management
Try these in order:
- Connect it directly to a different USB port, without a hub or docking station.
- For an external drive with a detachable cable, test another compatible cable.
- In Disk Management, select Action → Rescan Disks.
- Test the drive on another computer.
If it is also missing from Disk Management on another computer, the drive has probably failed; contact its manufacturer or a professional recovery service if it contains important files.^3^
3. Check Device Manager for a detection error
- Right-click Start → Device Manager.
- Expand Disk drives and Universal Serial Bus controllers.
- Look for the USB device or any item with a yellow exclamation mark.
- Right-click it and select Properties.
- Read the error under Device status.
Windows documents that a yellow warning can indicate a device or driver problem; the displayed error code determines the appropriate correction.^4^
As a final device-redetection step, right-click the affected device, select Uninstall device, and then choose Action → Scan for hardware changes, or disconnect and reconnect the drive.^2^
References