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Secondary storage device is USB and also the external hard disk are external devices these are best for external memory.
RAM
Intenal memory is only primary memory. The term secondary memory is used for External storage like hard disk etc.
Internal sorting it means we are arranging the number within the array only which is in computer primary memory. External sorting it is the sorting of numbers from the external file by reading it from secondary memory.
Internal and External. Internal - also known as Primary Memory, comes inbuilt when the computer is manufactured and mainly used to run the computer while external - also known as Secondary Memory can be added to the computer storing data and information for future use
Computer memory is categorized into primary and secondary memory. While primary memory is the main memory of the computer which is used to store data or information temporarily, whereas secondary memory refers to external storage devices that are used to store data or information permanently.
Since primary memory is not sufficient to store large volumes of data, externally some memory is added.this is known as hard disk which is also known as secondary memory
size range of secondary memory
External secondary data - data that is obtained outside the firm itself.
The immune cell that allows for subsequent recognition of an antigen resulting in a secondary response is called a memory cell. Memory cells are small, long-lived lymphocytes.
Usually the hard drives are considered secondary. The RAM (Random Access Memory) is the primary memory.
secondary memories are the memories by which CPU proccesses his programs and application.