If I lose or someone steals my laptop whoever has it will be unable to access any of my personal or client data. In my profession, I am ethically obligated to secure client data. I keep all of my data on a separate partition and encrypt that entire partition with DiskCryptor. I have set it up so the Diskcryptor password is required after any shutdown or reboot. It provides great peace of mind. Using a boot password rather than encryption provides some protection, but the disk can be pulled and used as a slave in another computer to gain access to the data. When encrypted the data is totally unavailable to prying eyes.