Computer data storage,often called storage or memory refers to
computer components, devices, and recording media that retain
digital data used for computing for some interval of time.Computer data
storage provides one of the core functions of the modern computer,
that of information renention.It is one of the fundamental components of
all modern computers and coupled with a central processing unit
(CPU a processor) implements the basic computer model used since
the 1940s.
primary storage(main memory or interal memory) often
referred to simply as memory,is the only one directly accessible
to the CPU. The CPU continuously reads instructions stored there
and executes them as required.
Secondary storage(external memory) differs from primary
storage in that it is not directly accessible by the CPU.The computer
usually uses its input\output channels to access secondary storage
and transfers the desired data using intermediate area in primary
storage.Secondary storage does not lose the data when the device
is powered down it is non-volatile.Per unit it is typically also an order
of magnitude less expensive than primary storage.
Tertial storage or tertiary memory,provides a third level of storage.
Typically it involves a robotic mechanism which will mount (insert)
and dismount removable mass storage media into a storage device
according to the system's demand's this data is often copied to
secondary storage before use.
Non-volatile memory retain the stored information even if it is not
constantly supplied with electric power.It is suitable for long-term storage
of information.Nowadays it is used for most of secondary, tertiary,
and off-line storage.In 1950s and 1960s it was also used for primary
storage,in the form of magnetic core memory.
Volatile memory requires constant power to maintain the stored
information.The fastest memory technologies of today are volatile ones
(not a universal rule).Since primary storage is required to be very fast,
it predominantly uses volatile memory.
Output
An output device is any piece of computer hardware equipment
used to communicate the results of data processing carried out
by an information processing system.
computer components, devices, and recording media that retain
digital data used for computing for some interval of time.Computer data
storage provides one of the core functions of the modern computer,
that of information renention.It is one of the fundamental components of
all modern computers and coupled with a central processing unit
(CPU a processor) implements the basic computer model used since
the 1940s.
primary storage(main memory or interal memory) often
referred to simply as memory,is the only one directly accessible
to the CPU. The CPU continuously reads instructions stored there
and executes them as required.
Secondary storage(external memory) differs from primary
storage in that it is not directly accessible by the CPU.The computer
usually uses its input\output channels to access secondary storage
and transfers the desired data using intermediate area in primary
storage.Secondary storage does not lose the data when the device
is powered down it is non-volatile.Per unit it is typically also an order
of magnitude less expensive than primary storage.
Tertial storage or tertiary memory,provides a third level of storage.
Typically it involves a robotic mechanism which will mount (insert)
and dismount removable mass storage media into a storage device
according to the system's demand's this data is often copied to
secondary storage before use.
Non-volatile memory retain the stored information even if it is not
constantly supplied with electric power.It is suitable for long-term storage
of information.Nowadays it is used for most of secondary, tertiary,
and off-line storage.In 1950s and 1960s it was also used for primary
storage,in the form of magnetic core memory.
Volatile memory requires constant power to maintain the stored
information.The fastest memory technologies of today are volatile ones
(not a universal rule).Since primary storage is required to be very fast,
it predominantly uses volatile memory.
Output
An output device is any piece of computer hardware equipment
used to communicate the results of data processing carried out
by an information processing system.
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