Computer viruses are programs that can enter a computer system without the users knowledge and damage the information contained on floppy and hard disk drives. Viruses can usually be detected by anti-virus software that scans computer files before they are copied to a computer. Floppy disks and hard disk drives can be easily damaged by contact with magnetic sources, or damaged physically by bending floppy disks. Once damaged, in many cases the data contained on the disks cannot be recovered. It is important to know how each of these storage media can be damaged, and precautions that can minimize the potential for damage.
Information stored on a computer is subject to the same threats as information on paper.
It can be lost, damaged, or stolen. Creating a backup copy, that is stored elsewhere, of all important information is essential, and usually a simple procedure. Computers that are used to control processes are subject to the same threats as any other computer, but since the entire process is dependent on the computer functioning properly, extra care should be taken to protect the computer and the programs and data on the computer from damage. Minor errors in data entry can make it impossible to find an important file. Proper accounting and storage of computer files is an important aspect of data security.