Please restart your PC and try it again. If it does not work again, you could reinstall Partition Assistant (PA). If you reply with a question, please include the brand, model of your USB Stick, and a screenshot.Sandisk & Western Digital WD Drive Utility: https://support-en.wd.com/app/answers/detailweb/a_id/31759#subject2
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https://support-en.wd.com/app/answers/detailweb/a_id/31759#subject2