Explain differance between Primary and secondary storage ?

• Primary and secondary storage

Computer storage is classified within primary(main) memory and secondary(peripheral) storage.
a) Primary storage is commonly RAM; ~10ns access time
b) Secondary storage is commonly hard disk drives; ~10ms access time
c) Secondary storage is a lot cheaper than primary, 3¢/Mb vs.$1/Mb.

• Secondary storage is persistent

a) Databases are stored in secondary memory, and large databases are manipulated in secondary storage.
b) We required minimising disk accesses while accessing and manipulating databases.

Posted Date: 5/11/2013 5:32:44 AM | Location : United States

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