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What is the fastest memory to access? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

The fastest access speed is the magnetic tape memory, which belongs to the magnetic surface memory and takes the magnetic tape as the storage medium. the tape drive is composed of a magnetic tape drive mechanism and a magnetic head, which can drive the magnetic tape to move relative to the magnetic head and use the magnetic head to carry out electromagnetic conversion. record or read data sequentially on magnetic tape.

Magnetic tape memory characteristics

After the magnetic material is magnetized, the working point is always on the magnetic hysteresis loop. As long as the amplitude of the external forward pulse current (that is, the external magnetic field) is large enough, then the magnetic induction intensity B is not equal to zero after the current disappears, but in the + Br state (positive remanence state). On the contrary, when the negative pulse current is applied, the magnetic induction intensity B will be in the-Br state (negative remanence state). When the magnetic material is magnetized, it forms two stable remanence states, just like the flip-flop circuit has two stable states. If it is stipulated to use + Br state representation code 1, which is code 1, to make magnetic material remember 1, it is necessary to add positive pulse current to make magnetic material positive magnetization; to make magnetic material memory 0, negative pulse current should be added to make magnetic material reverse magnetization. The remanent magnetic state on the magnetic material forms a magnetization element or storage element, which is the smallest unit for recording a binary information bit.

Storage principle

Magnetic tape memory belongs to magnetic surface memory, and the external memory of computer is also called magnetic surface storage device. The so-called magnetic surface storage is to use some magnetic materials thinly coated on the metal aluminum or plastic surface as carrier magnets to store information.

A tape controller is an interface device that connects a computer with a tape drive. A tape controller can connect multiple tape drives. It is a control circuit device used by the computer to access data on magnetic tape, which can control the tape drive to perform operations such as writing, reading, advancing and retreating files, etc.

Tape drive is a digital magnetic recording device with magnetic tape as recording medium. it is composed of magnetic tape transmission mechanism, servo control circuit, read-write head, read-write circuit and related logic control circuit.

Magnetic tape is a kind of soft ribbon magnetic recording medium, which is composed of tape base and magnetic surface layer. The tape base is mostly thin film polyester material, and the magnetic surface layer is mostly made of γ-Fe2O3 and CrO2. Tape memory accesses data sequentially. Tapes that store data can be saved offline and read interchangeably. In addition, it has the characteristics of large storage capacity, low price, easy to carry and so on. It is one of the important peripheral devices of the computer.

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