You wouldn't think of leaving your office door unlocked when you leave for the night. Your really important business documents are stored in a fireproof safe. Don't your digital secrets deserve the same level of protection?

If your laptop is lost or stolen, you can replace it. But if the thief can access the files on that device, you could be in big trouble. That's where encryption becomes essential. A thief who encounters an encrypted hard disk or flash drive can't access its contents without your password—he can reformat the disk, but he can't decode the contents.

On modern Windows PCs, you have at least four useful en ...

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