This refers to a secondary storage medium that utilizes magnetism to store data. Examples include magnetic disks (hard disks and floppy disks) and magnetic tapes.
Risks to data storage on a magnetic medium:
1. Strong magnetic fields- these could destroy the data on the medium altering the magnetic patterns on the media
2. Intense heat- this alters the magnetic patterns on the media thus destroying the data represented those magnetic patterns.
3. Dust- this results in hard disk crashes and also may render floppy disks unreadable. A disk crash is a situation that arises when dust particles come into the space between a read- write head of a hard disk and the disk plate. Disk crashes render a hard disk unusable thus resulting in loss of stored data.
4. Theft- since magnetic media are portable, they are liable to theft. Stealing a magnetic medium device is as good as stealing the data it contains since the data stored can be accessed after the device has been installed on another terminal.