Sophie answers the question, "what is a computer?" She uses an analogy involving a person at a desk to illustrate how computers process information and discusses the different components in a computer, such as a hard drive, memory, and a processor. She then talks about binary, the language of computers
In this episode the data from a murdered researcher's computer is recovered after being "wiped". In the clip, Charlie uses the basics of magnetism and binary encoding to explore how the two are combined to store data on hard disk drives and how this data might be recovered after being overwritten with other data.
While investigating a major meth laboratory, Charlie and Megan recover a hard drive belonging to the primary meth distributor. Unfortunately, the disk had been badly damaged by the explosion of the meth lab. In spite of that - and luckily for the investigators - in many cases it is still possible to recover data on a badly damaged drive by making use of a computer's built-in redundancy in data. Essentially, even large portions of the files on a drive are lost or erased, because of symmetry and redundancy in most modern data storage, Charlie had a chance!