What is memory?
A memory unit is the collection of storage units or devices together. The memory unit stores the binary information in the form of bits.
Types of Memory
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| Figure : Conventional types of memory |
Volatile Memory: It loses
its data, when power is switched off.
Non-Volatile: This is
a permanent storage and does not lose any data when power is switched off.
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| Figure : Classification of Memory |
Primary
Memory: It is also called Temporary or Main memory.
Secondary
Memory: It is also called Permanent or Auxiliary memory.
Classification of Auxiliary Memory
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| Figure : Classification of Auxiliary Memory |
Characteristics of auxiliary memory
Non-volatile
memory − Data is not lost when power is cut off.
Reusable − The
data stays in the secondary storage on permanent basis until it is not
overwritten or deleted by the user.
Reliable −
Data in secondary storage is safe because of high physical stability of
secondary storage device.
Convenience −
With the help of a computer software, authorised people can locate and access
the data quickly.
Capacity −
Secondary storage can store large volumes of data in sets of multiple disks.
Cost −
It is much lesser expensive to store data on a tape or disk than primary
memory.
Memory Hierarchy in Computer
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| Figure : Memory Hierarchy in Computer |
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