3.5inch floppy disk

It is the most commonly used floppy disk.It consists of 3.5 inch diameter disk encased in a square,hard plastic jacket cover. The jackeet cover has a cutout (aperture) for read/write head to make contact with disk surface.
This aperture is covered with slidingmetal piece. When a floppy disk is inserted into a floppy-drive for use the metal piece slides back to expose the disk's surface to the drive's read/write head

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