Encrypt whole laptop harddisk
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 can any one suggest me an opensource thing to encrypt my laptop harddisk. 
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 You'll find that many modern OSs have built in support, including Windows, Linux and BSD. What OS are you using (eg "Windows 7 Pro" or "Ubuntu 11.04" or "FreeBSD 8.2"). 
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 I want it from XP to win 7 
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 what about truecrypt?? 
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 @aby: what about truecrypt?? @aby: can any one suggest me an opensource thing to encrypt my laptop harddisk. @truecypt: T r u e C r y p t 
 Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux
 Main Features:Creates a virtual encrypted disk within a file and mounts it as a real disk. Encrypts an entire partition or storage device such as USB flash drive or hard drive. Encrypts a partition or drive where Windows is installed (pre-boot authentication). 
