What is a Hard Disk Drive?, HDDs Explained

Can someone ID the maker of this demonstrator disk drive? This 5-1/4 drive was created with its transparent top to explain how hard disks work. But there's no name on it.

An Overview about External Hard Drive

SSD and HDD: What's the difference? - GadgetMatch

How to Check Your Hard Drive's Health

What's the Meaning of HDD - MiniTool

SSD Vs. HDD: Which Is The Better Choice? - Fossbytes

Hard disk drive

Hard disk drive platter - Wikipedia

Anatomy of a hard drive

What is a Hard Disk Drive (HDD)? - Utmel

File:Laptop-hard-drive-exposed.jpg - Wikipedia

Magnetic Disk Drives How it works, Application & Advantages