Hi there,
When looking for attached hard drives or USB flash drives using Windows Explorer, you may notice that some drives are not seen in Windows Explorer or the drive may disappear after a short time or when Windows resumes from Sleep or Hibernation. This can be caused by any of the following:
Your drive does not have a drive letter assigned to it in Disk Management
The drive may be disabled or offline
Your USB driver may be corrupted
Corrupted registry keys may be causing issues with connecting to your Disk
I suggest you try the Resolution in the below link and see if that is Helpful
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