All anniversaries are special, and so is this one. It's particularly special because a billion or more people have been and are being affected by it every day. They switch on their PCs and take advantage of Intel processors and Microsoft's Windows, or Mac OS, thinking nothing of it. But before these, and providing a foundation for them, came spinning disks, rotating hard disk drives, the electro-mechanical phenomenon that the world of computing has depended on for decades: 55 years to be precise.

[theregister.co.uk...]
Will still be around for a few more years yet!