This image is of the inside of the drive itself. The drive has been removed from the caddy and the controller boards have been removed. A lid from the top of the drive has also been removed. This part of the drive is normally sealed from dust and the air inside is filtered. 

A 'voice coil' motor is used to move the heads over the disk surfaces.   'Click' on the main image to see the drive with the motor and head assembly removed. 

Voice coil motors are used because of their fast and accurate movement. They work in the same manner as a coil in a loud speaker does to produce sound.

The image below is of the head assembly removed from the drive. The heads glide just above the surface of the disks when they are spinning and can magnatise (write) or read the magnetic surface coating on the disk. Disks like these which appear brown use oxides of iron as the magnetic media.  

It is worth mentioning that '1' and '0' are not written to the disk surface. Only momentary transitions can be written and read on the magnetic surface. These have to be converted to represent the digital data.

Filters shown in the last picture are used in drives to remove any small particles that could travel between a disk and the head. The small filter protects the drive from external air. The large filter cleans air cycled within the drive removing any particulate from the disks or components themselves. These filters should last for the life of the drive and are not intended to be replaced.

Want to dismantle it more? Just 'Click' on the image

 Below the read/write head assembly can be seen comprising of 11 individual heads

The drive filters are shown below