3.5inch floppy disk

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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

All 3.5 inch floppy disk are of double slided type that record data on  the both disk surfaces. However they come in three different capacities - double density, high density and very high density.The double density 3.5 inch diskettes have 40 tracks,18 sectors and 521 bytes, givinga total disk storage capacity of 2(for two surface) × 40 × 18 × 512 = 7,37,280 = 720 KB (approx.). The high density 3.5 inch diskettes have 80  tracks,18 sectors, and 512 bytes, giving a total disk storage capacity  of  2 × 80 × 18 × 512=14,74,560 bytes = 1.4 MB (Approx.) The very high density 3.5 diskettes have 80 tracks, 36 sector and 512 bytes,giving a total disk storage capacity  of  2 × 80 × 36 × 512=29,49,120 bytes = 2.88 MB (Approx.)