Usually there is no damage done to data on the hard drive. However, it may corrupt the contents of infected diskettes. On the hard drive, Form moves the original boot sector and a portion of itself and stores it in the last two sectors of the infected hard drive. If these sectors are overwritten by data at a later date, the system may hang during the boot-up process. However, you may still access the drive.
Form creates bad sectors on floppy diskettes.
The area of the FAT where the code is stored is marked as bad, so that the information will be preserved and remain undamaged. Indications of Infection One indication of the Form virus is a clicking noise produced when any key on the keyboard is pressed on the 18th day of any month. Please note that if a keyboard driver is used, the clicking noise is undetectable. Another symptom of infection is that your system will hang on a failed disk read. Form consumes 2k of memory.