All I want to do is erase this USB Drive


last night used boot camp install windows 10 on 2014 macbook pro 13". went smoothly installation, ran issue when went format usb drive used setup. (formatted fat32) couldn't format disk utility because found read only. popped terminal , tried format "diskutil" using superuser permissions. still wouldn't work. getting error code 69877. attempted use gpt tool force delete partition, telling me "permission denied."

booted windows try erasing there. tried methods know including formatting through windows explorer, administrator tools, , diskpart in command prompt.

nothing working. drive doesn't want formatted. suggestions?
 

is flash drive or external usb hard drive? if flash drive, there may slide switch on makes read-only.
 


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