Part Amzb

Media And Storage ----------Types of media continued Session 2 AM Zeus-Brown

Topics For Today 

Read/Write mechanics for: • Optical • Solid state • Magnetic

Optical Read/Write 

Spot (Beam) diameter • wavelength of light / Numerical Aperture



Depth of focus •

wavelength of light / (Numerical Aperture)2 

For the current optical storage systems, the depth of focus is about 1 mm.

Solid State Read/Write 

MOSFET (Meta-Oxide-Semiconductor Field-Effect Transistor)

Magnetic Read/Write 



The drive channel electronics receive data in binary form from the computer and converts them into a current in the head coil. The current in the coil reverses at each 1 and remains the same at each 0. This current interaction with the media results in magnetization of the media, which direction depends on the current direction in the coil.

Hard Disk Mechanics MR Reading Head Shields

Inductive Writing head poles Coils

MR Sensor

LAB Session 

Storage examination • Examine each of the device’s in true make detailed notes and diagram