Floppy Disk

It is a Magnetic type secondary storage media.It is Composed of a thin magnetic disk encapsulated in a rectangular plastic cover lined with fabric that is used to remove dust particles.They came in different sizes i.e. 8-Inch, 5.25-Inch and 3.5 Inch.The 8-Inch and 5.25-Inch floppy disks are obsolete now and only 3.5 Inch floppy is used rarely for the emergency start up of system or to update firmwares.Fig(1) given below shows a 3.5 Inch Floppy disk and various Parts of it.It mainly consist of Following Parts:

i)A hub that engages with drive motor
ii) A hole that identifies its capacity.
iii)A Shutter for protection,when removed from computer.
iv)A Plastic Housing
v)two polyester sheet to sandwich the magnetic disk in the middle to reduce friction.
vi)Magnetic coated plastic disk.
vii)A write Protection notch.

On th other hand 5.25" Floppy does not have any metallic hub and has a large whole in the center for the drive's spindle and a oval shaped aperture in both sides of the plastic to allow the drive's heads to read and write data. A small notch on the right of the disk identifies that it is writable, if it is not present, the disk is read-only.It also has a index hole near the center to detect the angular start of each track and whether or not the disk is rotating at the correct speed.and the magnetic material is sandwiched between tho layers of fabric to avoid friction.