TrueCrypt is a popular tool for performing encryption of a volume of data, but it can provide an additional layer of protection by hiding a volume inside an already-encrypted volume.

TrueCrypt是一个常用的工具，可以执行大量数据的加密操作，但是它还提供了一个额外的保护层，在已经加密的卷中隐藏一个卷。

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Whole Disk Encryption volume.

全磁碟加密卷。

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Many observers have suggested defensive techniques that deploy TrueCrypt disk encryption with hidden volume partitions or PGP Whole Disk Encryption rendering the entire computer unbootable thereby making even file time and date stamps unavailable.

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