how can i format my flash drive?

i can see my file in the flash drive. i can copy them. but when formatting its shows a message like " windows was not complete the format". beside i cant delete any file of my flash drive and can not send any file into my flash drive and theirs also a message I/O error.
i tried to format it in various way but it doesn't work.

what should i do now??
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More about format flash drive
  1. Try formatting it using a software like Rufus.
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