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2. Optical disc recording technologies - Wikipedia

   en.wikipedia.org/wiki/Optical_disc_recording...

   Phase-change discs are designated with RW (ReWriteable) or RE (Recordable-Erasable). Phase-change discs often appear dark grey. Another technology creates pits in an inorganic carbon layer, a "write-once" option. Created by Millenniata, M-DISC, records data on special M-DISC with a data life-time of several hundred years. [1]

3. CD-RW - Wikipedia

   en.wikipedia.org/wiki/CD-RW

   The CD-MO standard allowed for an optional non-erasable zone on the disc that could be read by CD-ROM units. Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. Dy Fe Co or less often Tb Fe Co or Gd Fe Co ) to its Curie point and then using a magnetic field to write the new data, in a manner ...

4. Magneto-optical drive - Wikipedia

   en.wikipedia.org/wiki/Magneto-optical_drive

   Each write cycle requires both a pass to erase a region and another pass to write information. Both passes use the laser to heat the recording layer; the magnetic field is used to change the magnetic orientation of the recording layer. The electromagnet reverses polarity for writing, and the laser is pulsed to record spots of "1" over the ...

5. Optical media preservation - Wikipedia

   en.wikipedia.org/wiki/Optical_Media_Preservation

   The preservation of optical media is essential because it is a resource in libraries, and stores audio, video, and computer data. While optical discs are generally more reliable and durable than older media types, (magnetic tape, LPs and other records) environmental conditions and/or poor handling can result in lost information.

6. Magnetic-tape data storage - Wikipedia

   en.wikipedia.org/wiki/Magnetic-tape_data_storage

   Magnetic-tape data storage is a system for storing digital information on magnetic tape using digital recording. Tape was an important medium for primary data storage in early computers, typically using large open reels of 7-track , later 9-track tape.

7. Magnetic storage - Wikipedia

   en.wikipedia.org/wiki/Magnetic_storage

   Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads.