I was doing some blacksmithing in high school, mostly knifes.
When reaching 800°C steel is not magnetic anymore, it’s also a good temperature to start forging the steel. So I needed a atrong magnet to know when the steel was hot enough, I used what I have available: a hard drive magnet.
It felt quite “mad-maxy” to disassemble a broken hard drive to use it as a tool to forge knifes