James Zhou 2000

Created a USB flash drive when I worked on Android projects and when I want to convert this drive to a bootable Windows 8.1 system, I cannot get a clean drive because the disk management tool in windows cannot delete the EFI drive. After a little search online, I found someone already posted a solution. Basically we need to use "diskpart" under administrator account, and then "list disk" to check the list of drives, and then use "select disk 1" or any drive that has issues, and then use "clean" command to clean up everything. After that, going back to disk management we will be able to create a primary partition. Sometimes the drive might get locked but this can be fixed by unplugging and re plugging the flash drive.