What effects don't viruses have?

At the moment, there are no known viruses that can directly harm the hardware (CD-ROMs, floppy disk drive, etc) or overwrite the information stored in write-protected media (for example, a CD-ROM), or affect other elements that may be near the computer, such as credit cards.

However, there are currently some threats that can damage the BIOS (Basic Input/Output System), the operating system (avoiding its normal running) or completely delete the information stored in the hard drive. Though these actions may make the computer work improperly, they cannot cause an irreparable physical damage.

Lastly, bear in mind that although at the moment there are no viruses that may cause damage to the hardware, it does not imply that in the future a threat of such characteristics could not be developed.