External Memory I believe that the External Memory section should be broken into two separate sections or more firmly defined within the same section One on Self Identity and using external objects to identify ones self and External Memory being stored memories and information Here are my reasons  Self Identity In Stand Alone Complex Episode  Batou says to Kusunagi about her watch No matter how many prosthetic bodies you went through this was the one thing that was always ticking away the same time as you right In this time thats far too fleeting people entrust memories to external devices because they want to set down proof that can identify them as a unique individual For you isnt that watch the one external mnemonic device that can identify the person youve been up until now  This says that external mnemonic devices are to create a sense of unchanging self in a world where you can switch physical bodies on the fly As biological humans our forms are fixed and unchanging for the most part and our self identity is tied deeply with that In the GiTS universe that is not true and you must tie your selfidentity to external objects such as a watch or weight training to distinguish yourself from the rest of the identical mass produced cyborg bodies and create a sense of individuality There are references in SAC ng Gig Episode  about cyborg food satisfying the brains cravings and as a reminder of times before becoming a cyborg In SAC nd Gig Episode  there is a store that keeps and maintains external mnemonic devices that remind their owners of their own personal memories All of these external mnemonic devices are used to trigger memories in ones self but can not relay detailed information to a stranger  External Memory External Memory is exactly that memories and experiences that are stored offline onto a hard disk or such If you posses a cyber brain there is a definite separation of mind and body since your brain case can be removed and put into a new body Since there is an electronic separation the signals received from the senses touch taste etc can be recorded and replayed at any given time Thus you could record important events such as your wedding day and replay it as if you were actually there anytime you wish Your external senses turn off and youre fed recorded sensory information Better than any video camera recording your feeling the heat of the sun the breeze your brides hand trembling as you slip the ring on her finger etc Storing these memories also allows others to play them back and experience them as well This would be a highly valuable technology for all areas of use fully immersive gaming and movies virtual business meetings that feel completely real instantaneous access to wikipedia anywhere In SAC ng Gig Ep  Batou talks about using Kusunagis external memories to keep Gohda talking in Ep  He also talks about peeking at her external memories regarding Kuze In SAC Ep  Ishikawa experiences Batous memories from the murder scene SAC Ep  the whole team replays Togusas memories from the Sunflower Society office when he was shot