Formatted USB and installed windows but cannot reformat drive

Recently ive tried to install windows onto my laptop. I formatted USB and installed windows but cannot reformat drive the drive. I even tried to have bootcamp reformat the drive and it says it cant. I opened disk utility and it cannot do anything to it. I just want my flashdrive working again.

Your USB flash Sandisk is correctly formatted as a FAT disk and called Wininstall when you used Bootcamp Assistant and checked the second check box to download BC drivers.
If you are unable to see the FAT partition which will become NTFS for you Windows installation, that is a different issue.
Have you looked at https://help.apple.com/bootcamp/mac/5.0/help/ ?

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