So I have a disk divided into 4 partitions. I want to encrypt it (probably TC\VC, maybe DC, but it looks "strange"). So I have some questions: if I encrypt partitions one by one, is the whole disk encrypted ? if the disk\partition is formattted, are the "deleted" files still encrypted ? how "strong" AES 256 is (assuming long, complicated, complex as hell password, etc.)? Semi-interested script kiddie ? Police ? FBI ? NSA ?