Unable to Mount Ext HDD Volume in Mac

Problem:
$ sudo mount -t exfat /dev/disk2s2 /mnt/
mount_exfat: /dev/disk2s2 on /mnt: Resource busy

$ diskutil unmountdisk /dev/disk2s2
Unmount of disk2 failed: at least one volume could not be unmounted

Solution:
$ hdiutil detach /dev/disk2s2
"disk2" unmounted.
"disk2" ejected.

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