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How do I make a flash drive or a flash drive partition so that it would only be read-only and will not be affected by a virus. Maybe making the flash drive be treated as a CD on other computer so that its not possible to write any kind of data into it.

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Not physically possible. –  Hello71 Jun 18 '10 at 21:40

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up vote 2 down vote accepted

This requires special hardware or firmware support, and is not something you can reliably do with stock flash drives, short of virtually mounting a ISO9660 image file.

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