If I get too close to my PC's hard drive HDD with a magnet will it get damaged or destroyed?, this is something I always wondered about so I decided to try it on one of my computers and the results were both surprising and interesting. 
I also try the same test on a Solid State Drive aka SSD.

here's more info on why a modern HDD Hard Disk Drive is very hard to damage with a magnet: https://superuser.com/questions/983234/can-magnets-damage-or-wipe-a-laptop-hard-drive

I have read that old floppy disks were very easy to damage with a magnet but we don't use those anymore.