How strong of a magnet do you need to erase the data on an old

Do Magnets Affect Credit Cards?

Deleting Personal Data When Recycling Electronics

How can magnets be used to separate junk in a junk yard? - Quora

Can Magnets Destroy Hard Drives? - Northeast Data Destruction

Hard Drive vs. Monster Electromagnet - Will it erase?

Why were magnetic tapes used to replace punch cards in second

Hard Drive Destruction

Why Do Magnets Wipe Hard Drives?

3 Ways to Determine the Strength of Magnets - wikiHow

Who invented magnetic tape recording? - Quora

Measuring Magnets