What wrong is this partition?

[Guest oem7110]

When I remove an unused partition, it shows following error message, and I get no idea what is using it, which is simply 64mb empty space.

 

 

Not able to finish, because partition is opened or being used, it could be set as system, bootup, virtual memory or keep a damage printed file.

 

Partition (T:) is being used at this moment, if you force to remove this partition, please press Yes

Warning: force to remove may cause the application using this partition error accidently, do you want to continue?

 

 

After I force to remove it, and create a partition (T:), I remove it again for testing, there is no error message, it seems strange on this partition, does it have any hidden activity on it?

 

 

Does anyone have any suggestions on what is going on?

 

Thanks in advance for any suggestions :>

 

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