Some laptop manufacturers are providing support for hardware encrypted disk drivers. One of them is Lenovo.
Using a drive that supports this encryption is much better than using software encryption solutions because it does not limit the range of OS to choose from and more important is not slowing down your computer. Details http://en.wikipedia.org/wiki/Full_disk_encryption
Example products: * ThinkPad 200GB Security (FDE) 7200 rpm Serial ATA Hard Drive * Seagate ST9160824AS, Seagate 160GB ST9160414ASG, Seagate 160GB ST9160414AS, Seagate 320GB ST9320424AS,* Seagate 320GB ST9320424ASG * Hitachi part numbers supporting BDE (the same thing as FDE) http://www.hitachigst.com/hdd/support/bulk_faqs.htm
What is worse is that I tried at several retailer to order one of them but nobody was able to deliver me one. One of them received the order, get the money and after more than one week I received an email telling me that the product is not available and they refunded me.
More than one month ago I used the contact form all these manufacturers to ask them about these HDD products - still no answer. I wonder if these are virtual products ;)
The question is: do you use one of them? where could I order one?