Most of the computer parts are harmless from magnets. But do not ever close a magnet (99% Powerful magnet) to old floppy disks, definitely disk becomes useless. Good thing is now days these floppy disks use very rarely. These days’ people use to use flash drives, SD memory cards, portable hard disks, compact memory cards etc, good news is magnet cannot do anything to thing modern memory devices. So there’s no any harm with magnets to flash drives, SD memory cards, portable hard disks, compact memory cards. These memory devices do not have any components that sensitive to magnetic field.
Normal magnets cannot erase the hard disk data too. But there are some special magnets, which can erase the data of hard disk (those magnets not found in day today life). So most of the computer parts do not have any harm from magnet but remember not to close a magnet to screen.
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