How to erase disk partitions on U disks on Windows?
Check the HDD LLF low level format tool:
http://hddguru.com/software/HDD-LLF-Low-Level-Format-Tool/
It is free for personal usage.
Run it as Adminiatrator and you can choose to erase partitions and MBR on the U disks.
Be careful that the operation is is recoverable.
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