Reading through a dirty monitor may also cause eye fatigue, eye strain or headaches. Diskette Storage Magnetic storage media needs maintenance attention. Excessive heat can warp a tape. Excessive humidity can deteriorate the chemicals used on the media surface. Even clean skin contains body oils that attract contaminants that can cause problems.
Magnetic fields can erase or obscure the data on the tape.
Other sources of magnetic fields include electric motors, transformers, power lines, telephones, and televisions. A computer virus is an executable computer program which can copy itself. The program, when it runs, will initiate some kind of event on the infected computer. What the virus does can range from an annoying message popping up on the screen periodically to the computer's hard drive being erased. Computer viruses are spread by the transfer of files between computers.