What is a...
...?
Definition:
A round, floppy piece of plastic that you put into a computer to store information. It is in a hard square cover for protection.
Explanation:
The disk is made of thin, Mylar plastic. Because it has a magnetic coating, you should keep magnets away from the disk. You put it in the floppy disk drive to use it.
Sentence:
"I saved my earthquake report on my floppy disk."
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