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2. Disk storage - Wikipedia

   en.wikipedia.org/wiki/Disk_storage

   The first commercial digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system. The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape.

3. Comparison of popular optical data-storage systems - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_popular...

   As of 2007 DVD is the de facto standard for pre-recorded movies, and popular storage of data beyond the capacity of CD. With the development of high-definition television , and the popularization of broadband and digital storage of movies, a further format development took place, again giving rise to two camps: HD DVD and Blu-ray , based upon a ...

4. Non-RAID drive architectures - Wikipedia

   en.wikipedia.org/wiki/Non-RAID_drive_architectures

   This storage is presented to the user as a single set of network shares. Drive extender technology expands on the normal features of concatenation by providing data redundancy through software – a shared folder can be marked for duplication, which signals to the OS that a copy of the data should be kept on multiple physical drives, whilst the ...

5. M-DISC - Wikipedia

   en.wikipedia.org/wiki/M-DISC

   M-DISC's design is intended to provide archival media longevity. [3] [4] M-Disc claims that properly stored M-DISC DVD recordings will last up to 1000 years. [5]The M-DISC DVD looks like a standard disc, except it is almost transparent with later DVD and BD-R M-Disks having standard and inkjet printable labels.

6. Density (computer storage) - Wikipedia

   en.wikipedia.org/wiki/Density_(computer_storage)

   DVD disks are essentially a higher-density CD, using more of the disk surface, smaller pits (0.64 micrometers), and tighter tracks (0.74 micrometers), offering a density of about 2.2 Gbit/in 2. Single-layer HD DVD and Blu-ray disks offer densities around 7.5 Gbit/in 2 and 12.5 Gbit/in 2 , respectively.

7. 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 ...