Storage medium

different one (masses) storage media

a storage medium serves for the storage of data and/or. Information.

One can differentiate here between only readable, uniquely recordable and again-recordable data media. In addition such media can be classified according to how the information on them is stored.

Storage mediacan be subdivided as follows:

Table of contents

physical storage

covers all storage media, for which mechanical treatment processes are needed. As examples the pressure of writing on paper and providing cuneiform script on clay/tone boards are mentioned. Here we find alsoall classical, not EDP-specific storage media. Differences exist here in the handling as well as the life span (durability) of the respective storage medium.

without aids to read

the information on these storage media can be processed by humans without technical aids directly

materials [work on

] with aids

around the informationfrom the following storage media to to read, one needs generally a technical aid. (Information on punch cards and paper tapes leaves itself in emergency in addition, without aids and/or. by means of a table.) punch cards

work on []

Electronic storage/ semiconductor memory

under electronic storage is summarized all storage media, which information in or on basis of electronic elements stores. Electronic storage takes place today practically only in silicon realized integrated circuits. The individual memory mechanismscan be differentiated according to the characteristic of the data retention:

  • volatile memory, to whose information, if they are not refurbished or the river is switched off, permanent
  • memory is lost, in which once stored or hard-wired information is, which does not change no morewill can and
  • semi permanent memory, which stores information permanently, in which however information be also changed can.

In order to be able to read electronic storage media, it requires also technical aids.

  • Volatilely:
    • DRAM, dynamic RAM (dynamic random ACCESS MEMORY)
    • SRAM (statics random ACCESS MEMORY)
  • permanent:
    • ROM (READ only MEMORY)
    • PROM (programable READ only MEMORY)

(see also permanent memory medium)

the final user already receives the electronic storage media frequently however not as individual memory module, but as combined product: In the case of DRAM for application as main memories in computers orPeripheral devices are combined several memory modules on so-called memory modules. The Flash memory liked for the storage of Multimedia data in mobile applications comes in various, usually housings implemented as memory card, which contain CONTROLLERs beside the actual memory module also.

magnetic storage

The magnetic storage of information takes place on magnetizable material. This can be applied on volumes, maps, paper or plates. Magnetic media (except core memories) by means of vintage/recording head read respectively are written. We differentiate here between rotary plates (stack), by means of a mobileHead to be read and written and not rotary media, which are usually led past a being certain head to reading/letter.

optical storage

optical storage uses filter, reflection and diffraction characteristics of different materials. With the film and in the photography colorfiltering characteristics are used, with CDsthe reflektiven characteristics and with Hologrammen the light-bending characteristics.

magnetooptic storage

magnetooptic storage uses the fact that some materials by magnetizationtheir optical characteristics change, in addition, that a laser beam can waive the magnetization of a magnetic material by means of heat induction. Magnetooptic media are picked out purely optically.

other storage

Further criteria for subdivision

  • describability
  • capacity and access speed
  • of life span

see also

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