a split stick

made here installation flash drive with Windows
all set, stick formatnul, but it happened something strange.
there was a second partition on 10 meters
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moreover, it appears only when a flash drive is connected to the TV.
well, in the BIOS it is possible to observe (uefi)
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in Windows the flash drive one, format in NTFS FAT32 or whatever,I thought the Acronis che thread to do one section is also shown.
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does anyone know how to remove this unwanted partition?the problem of course is not critical, just don't like the telly when you connect the flash drive starts this first empty part. the main part is through the source to choose.