• From a component perspective, all disk drives are basically the same. A disk platter, usually comprising an aluminum or glass substrate material that is sputter-coated with a magnetically corrosive media (chromium, ruthenium, etc.), provides a precision surface area in which discrete data bits can be written into a series of tracks.
Extract taken from “Disk Drives Walk the Same Walk - Jon William Toigo”
This highlights the fact that all disk drives are very similar in the production and make up of the physical drive.
The differentiators will be in the Drive Capacity, Rotation Time, I/O Interface, etc.
All of these features will be covered over the next few pages.