For your information, any form of disk formatting will completely erase data, so backup as many as important files before the start.

Step 1: Type cmd in the search box, then you can get the best match called Command Prompt. Right-click on it and choose "Run as administrator".

Step 2: On the Command Prompt window, type diskpart and press "Enter".



Step 3: Type list disk and press "Enter". According to the list disk information, check which disk is your USB flash drive. For example, disk 2.



Step 4: Now type select disk 2 and press "Enter".



Step 5: Type clean. Wait some time for disk erasing.



Step 6: Type create partition primary and press "Enter".



Step 7: After diskpart successfully created the specified partition, type format fs=ntfs and press "Enter". If you prefer other file system formats, change the command ntfs to the desired one such as fat32, exfat, etc.

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