Why can magnetic material be used as memory?
Computer external memory is also called magnetic surface storage device. The so-called magnetic surface storage, is to use some magnetic material coated with thin metal, aluminum or plastic surface as a carrier to store information. Disk memory and magnetic tape storage all belong to magnetic surface memory.
A magnetic surface memory is a 0 and 1 that represents binary information by using magnetic material coated on the surface of a carrier and having two different magnetization states". The magnetic material is uniformly coated on a circular aluminum alloy or plastic carrier to become a disk and coated on a polyester plastic tape to become a tape.
The advantages of magnetic surface storage for large storage capacity, low unit price, the recording medium can be used repeatedly, recording information can be preserved for a long time without loss, even offline archive, NDRO can read, do not need to reproduce the information.
