Which of the following is not used for storage purposes with main frame computers?

Which of the following is not used for storage purposes with main frame computers? Correct Answer diskettes

Although we can store the data in diskettes then why it is not used for the storage purposes. A diskette is a random access, removable data storage medium that can be used with personal computers.

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which type of computers are also called mid range computers?
Which type of Computers are also called midrange computers?