16 Facts About Secondary storage

Computer data Secondary storage is a technology consisting of computer components and recording media that are used to retain digital data.

Analysis of the trade-off between Secondary storage cost saving and costs of related computations and possible delays in data availability is done before deciding whether to keep certain data compressed or not.

Generally, the lower a Secondary storage is in the hierarchy, the lesser its bandwidth and the greater its access latency is from the CPU.

Primary Secondary storage, often referred to simply as memory, is the only one directly accessible to the CPU.

The particular types of RAM used for primary Secondary storage are volatile, meaning that they lose the information when not powered.

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Secondary storage is often formatted according to a file system format, which provides the abstraction necessary to organize data into files and directories, while providing metadata describing the owner of a certain file, the access time, the access permissions, and other information.

Tertiary storage or tertiary memory is a level below secondary storage.

Tertiary Secondary storage is known as nearline Secondary storage because it is "near to online".

Example, always-on spinning hard disk drives are online Secondary storage, while spinning drives that spin down automatically, such as in massive arrays of idle disks, are nearline Secondary storage.

Since the primary Secondary storage is required to be very fast, it predominantly uses volatile memory.

Distinct types of data Secondary storage have different points of failure and various methods of predictive failure analysis.

Magnetic Secondary storage uses different patterns of magnetization on a magnetically coated surface to store information.

Magneto-optical disc Secondary storage is optical disc Secondary storage where the magnetic state on a ferromagnetic surface stores information.

Important characteristics of such Secondary storage are possible expansion options: adding slots, modules, drives, robots.

Robotic Secondary storage is used for backups, and for high-capacity archives in imaging, medical, and video industries.

Hierarchical Secondary storage management is a most known archiving strategy of automatically migrating long-unused files from fast hard disk Secondary storage to libraries or jukeboxes.