17 Facts About Secondary memory

In contemporary usage, Secondary memory is usually semiconductor storage read-write random-access Secondary memory, typically DRAM or other forms of fast but temporary storage.

Core Secondary memory remained dominant until the 1970s, when advances in integrated circuit technology allowed semiconductor Secondary memory to become economically competitive.

Spare Secondary memory can be utilized as RAM drive for temporary high-speed data storage.

Main Secondary memory is directly or indirectly connected to the central processing unit via a Secondary memory bus.

Many types of "ROM" are not literally read only, as updates to them are possible; however it is slow and Secondary memory must be erased in large portions before it can be re-written.

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Secondary memory 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.

Optical discs and flash Secondary memory devices are most popular, and to much lesser extent removable hard disk drives.

Non-volatile Secondary memory retains the stored information even if not constantly supplied with electric power.

Volatile Secondary memory requires constant power to maintain the stored information.

The fastest Secondary memory technologies are volatile ones, although that is not a universal rule.

Dynamic random-access Secondary memory is a form of volatile Secondary memory that requires the stored information to be periodically reread and rewritten, or refreshed, otherwise it would vanish.

Static random-access Secondary memory is a form of volatile Secondary memory similar to DRAM with the exception that it never needs to be refreshed as long as power is applied; it loses its content when the power supply is lost.

Hardware Secondary memory encryption is available in Intel Architecture, supporting Total Memory Encryption and page granular Secondary memory encryption with multiple keys.

Semiconductor Secondary memory uses semiconductor-based integrated circuit chips to store information.

Since the turn of the century, a type of non-volatile floating-gate semiconductor Secondary memory known as flash Secondary memory has steadily gained share as off-line storage for home computers.

Non-volatile semiconductor memory is used for secondary storage in various advanced electronic devices and specialized computers that are designed for them.