Video cassette recorders differ substantially from audio recorders due to the use of a rotating magnetic head that uses a helical scan over the tape medium.
Throughout the 1960s and 1970s it acquired several companies in various industries: printing, sensors and magnetic heads, precision optical and photographic equipment, water quality monitoring equipment, and precision molding equipment.
A series of twelve movable magnetic heads (one each recording head and erasing head, and ten playback heads) were positioned around the disk, in contact with the tape.
A series of magnetic heads were distributed around the disk, in contact with the tape and their position could be moved along the circle.
The cleaning of the magnetic head is very important because it's responsible for the reading of the card and so it decides acceptance or rejection of the inserted card.
It was also considered more durable than magnetic tape, since it is not vulnerable to magnetic fields and is read by lasers instead of physical contact with a magnetic head.
If a magnetic stripe can be recognized, a shutter will be opened and the card will be transported to the second magnetic head by roles.
If no micro chip is placed on the card, the transaction goes directly above the magnetic head.
