Right, I want to secure my mac. Firstly, i understand a boot up BIOS password doesn't password the hard drive (i.e. you just take the hard drive out and someone can access all your documents). Is there any point in having a boot up password? The password that you set in security settings. Can you make it so that it cannot be removed by a system reset or password remover etc. Encrypted petition of the hard drive. This seems like the best option. Could i have say 20Gb of my hard drive encrypted, so that if someone stole my hard drive, documents stored in this petition could not be accessed. How would i go about this. And time capsule. How do i ensure that if someone steels my time capsule the data on it is secure and encrypted?