i'm looking to purchase a external hard drive to back up data,video,music. i like the look of the maxtor blackarmor. the capacity i need is at least 500gb-and up to 1tb i prefer the larger size,it needs to stay slim in size to fit in my suit pocket like james bond. it also needs to have goverment or law enforcement type encryption and simple to use on most computers so i can download and transfer files quickly.also antivirus software for this device.security is a must.