Portable external hard drives are nice, but what if that drive you're carrying around gets lost or stolen? What happens to your data? Sure, there are some software encryption schemes you can use to protect the drive, but those can be hacked, and data recovery services can usually get the data back. What you want for real security is hardware encryption on the entire drive, and that's what Maxtor offers with their BlackArmor portable drive.
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Review: Extremetech