Just got a 16 GB PNY flash drive from Wal-Mart and formatted it to ext4. Any idea how I could put access security on the drive? I would prefer security to protect against other OSs as well. Thanks.

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As cereal mentions, to do this you need to encrypt the drive. There are a number of tools to do this, including TruCrypt: http://www.truecrypt.org/

Is there a danger of data loss when encrypting information?

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