Select D, tape storage.
The recording method of tape memory mainly records by forming different write current waveforms, so the access speed is the fastest. It can drive the magnetic tape to move relative to the magnetic head, use the magnetic head to perform electromagnetic conversion, and sequentially record or read data on the magnetic tape.
Tape storage can be shared through the tape controller model mainframe. The tape storage can handle fiber optic connections at transfer speeds of up to 4Gbps - a patented mainframe fiber optic connection. The tape storage controller can also support up to four standard 8 Gbps Fiber Channel connections to disk drives or Fiber Channel switches.
If tape storage does not have enough FICON and the appropriate length and type of Fiber Channel cabling, connectivity between drives, mainframes, and storage networks will not be possible. Tape storage and controllers also require software upgrades and licensing support. This depends on the data center's current operating system and licensing model.
Extended information:
Tape drive structure principle:
The commonly used tape drive is a quick start-stop tape drive. It consists of driving wheel and reel drive mechanism, tape guide and buffer mechanism, magnetic head, reading and writing and drive control circuit.
Tape drive: Taking the vacuum buffer box tape drive as an example, the tape goes from the tape supply reel to the take-up reel through the right buffer box, magnetic head, driving wheel, and left buffer box.
Tape reading and writing: The tape comes into contact with the magnetic head when it moves. When a current flows through the magnetic head coil, a magnetic field is generated near the magnetic head gap, which magnetizes a small area on the magnetic tape.
Data organization: A tape has a beginning mark (BOT) and an end mark (EOT), and several files can be recorded in the middle. Each file consists of 1 to several data blocks, and the two files are separated by labels.
Tape controller: A tape controller can be connected to several tape drives and control the tape drives to perform operations such as writing, reading, advancing and retreating files, and advancing and retreating data blocks.
Baidu Encyclopedia-Tape Storage