From Help Net Security:
Hardware encryption market revenue to reach $36.4 billion by end of 2015
There are a variety of ways to secure data, either on the perimeter or within the LAN, but the most fundamental method in a defense-in-depth model is hardware encryption. The advantage of hardware-based solutions is that they bypass many of the typical drawbacks of software-based solutions like performance degradation or vulnerability to attacks aimed at the encryption key stored in memory.
Because encryption is available at drive-level, this solution is not dependent on any software or operating system used, and usually cannot be turned off by users.
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