Hard drive encryption in windows

["Cesc Santasusana" <cesc.santasusana () nl thalesgroup com>]

Hi,

I am looking for a solution to encrypt the hard drives which contain confidential info. Ideally, this tool would be 
transparent and usable on all the drives on the computer/laptop  (from c: to z:). Ideally it would be easy to set up 
and manage, not a problem if the tool is not free. Any experience on this? What algorithm(s) does it use? 
Another option would be to use external encrypted drives to store the info. What are the options here?

I am looking for some background information, to short-list all the options. 

Thanks for the help!

Cesc



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