Microsoft has been evolving its BitLocker-based full disk encryption technologies since its debut in Windows Vista. In Windows 8, Microsoft offers it's best ever version of BitLocker to both consumers and businesses, and you can use an related feature, called BitLocker To Go, to protect portable storage devices like USB flash drives and hard drives.
Note: BitLocker and BitLocker To Go require Windows 8 Pro or Enterprise.
BitLocker and BitLocker To Go both provide full disk encryption functionality, unlike Microsoft's older encryption feature, EFS (encrypting file system), which can be applied at the file or folder level. (EFS is still included in Windows 8 Pro and higher if you need this level of granularity.) And though they use slightly different technologies under the hood, they're managed from the same place, the BitLocker BitLocker Drive Encryption control panel.
You can find the BitLocker Drive Encryption control panel most easily with Start Search (bitlocker).
More information on BitLocker 2 go
http://yogendranetworkbytes.blogspot.ca/2012/01/bit-locker-bit-locker-to-go.html
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