make filesystem on WSL2

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I am managing a Linux file system via WSL 2, and the version is ubuntu 20.04
I partitioned /dev/sda in the system disk list and got /dev/sda1, btw, /dev/sda is a virtual disk,
but I formatted it with mkfs.xfs /dev/sda1,
I failed with "mkfs.xfs: cannot open /dev/sda1: Device or resource busy"
later I tried with loop partition and I worked.
I cannot find a workable solution. Could you please help me?

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