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Form (computer virus)
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<p>Form was a <a href="/facts/Boot_sector_virus/IyTC1usq">boot sector virus</a> isolated in <a href="/facts/Switzerland/LcGuxeTe">Switzerland</a> in the summer of 1990 which became very common worldwide. The origin of Form is widely listed as Switzerland, but this may be an assumption based on its isolation locale. The only notable characteristics of Form are that it infects the <a href="/facts/Boot_sector/YubeSECp">boot sector</a> instead of the <a href="/facts/Master_Boot_Record/nEJerupp">Master Boot Record</a> (MBR) and the clicking noises associated with some infections. Infections under Form can result in severe data damage if operating system characteristics are not identical to those Form assumes. </p><p>It is notable for arguably being the most common virus in the world for a period during the early 1990s. </p>