Interesting...
Tertiary Storage

A much slower way of supplying data to the CPU of a computer than secondary storage or RAM.

A large number of tape cartridges or optical discs are stored. Often used for archived data, or very large stores of data.

Each tape or disc is retrieved by a robotic arm system, transferred to a device that reads the data, and then is replaced by the arm when data transfer has been completed.

 
The picture shows a storage system that holds 6000 tape cartridges for the National Centre for Atmospheric Research.

Over 1 petabyte of data is stored.
(1 petabyte is 1,125,899,906,842,624 bytes)

 
Internet Research :

Can you find details about other examples of tertiary storage?

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