Windows 10: Unable to unmount/eject a virtual drive - what is withholding it?

When unmounting a virtual drive I sometimes get a warning reading as follows " There are currently files opened on N:\: or shell windows from that logical device. If you do not close the files before dismounting from the logical device, data may be lost.Do you want to dismount the device anyway? " I used Process Explorer > Find > Find Handle or DLL Substring, then entered the drive-letter, like X: but there are no hits. Any suggestions what else to use so as to figure out what is withholding ejecting the drive. Note: It is not VHD(X) Thanks. (Windows 10 x64 1909)

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Unable to unmount/eject a virtual drive - what is withholding it?

When unmounting a virtual drive I sometimes get a warning reading as follows
"
There are currently files opened on N:\: or shell windows from that logical device. If you do not close the files before dismounting from the logical device, data may be lost.Do you want to dismount the device anyway?
"
I used Process Explorer > Find > Find Handle or DLL Substring, then entered the drive-letter, like X:
but there are no hits.

Any suggestions what else to use so as to figure out what is withholding ejecting the drive.
Note: It is not VHD(X)

Thanks.

(Windows 10 x64 1909)

 

Unable to unmount/eject a virtual drive - what is withholding it?

Thanks. I do "File > Exited" all applications. I use a Windows Explorer replacement, Directory Opus and also File->Exited that one. It isn't in the Task Manager list, also not under tab "Details". I also disabled protection (AV software), but still 'some' process seems to access the virtual drive. Don't know of any other tools that may cast some light on this.

 

Unable to unmount/eject a virtual drive - what is withholding it?

I occasionally get the same type message with USB Thumb drives and the Safely Eject function, usually the process is being held up by antivirus scanning or File Explorer being open to the drive or files on the drive. Waiting a couple of minutes after closing File Explorer frequently works but in other instances rebooting the computer was necessary. It may help to open Task Manager, right-click File Explorer/Windows Explorer and choose Restart rather than rebooting.