1.Plug in your pen drive
2.Type diskmgmt.msc in Run box to open Disk Management.
3.Select your drive’s partition.
4.Right click on it and select the option of “Delete Volume” in it.
5.This will delete the memory space allocated and free up the total space.
6.Now in the empty space created again right click and select “Create Volume” to create the space.
7.Select the file system and format the partition to be able to use it again.