A "mecha musume" with the ability to Scan people and things to gather more information about them. An informant who carries a lot of data in her body.
Disk is found by Blade, Eve, Cruz, Teruyama and Mio living in Iron Mountain. She is a 100 year old cyborg who acts as a museum and has the Scan fragment which allows her to know an opponents powers and measurements
After the teams fight with the Simeon Girl Force and Eve's abduction she travels with the team to fight Simeon. She aids the team by reading peoples fragments and hacking the testaments and other mechanical objects when needed. When Blade is hurt she saves him by climbing on top of him and hooking up to him since his body too is partly made up of machinery.
After the PF explosion her body was badly damaged and she travels around using her pigtails and when necessary a testament. She is found by Eve and Cruz and later gets help from Mio and Eve in finding her broken body and helping her put herself back together again. Disc does manage to repair her body, and sets out alongside Blade, Solva, Seto, and Eve to hunt down Simeji.
Disk has the Scan Fragment and is able to know her opponents fragment and measurements Being half cyborg she has many weapons her body parts turn in to. As an added bonus she can hack just about anything with little or no difficulty.