You're working late one night, and you notice that the hard disk on your new computer is very active even though you aren't doing anything on the computer and it isn't connected to the Internet. What is the most likely suspect?
a. A disk failure is imminent.
b. A virus is spreading in your system.
c. Your system is under a DoS attack.
d. TCP/IP hijacking is being attempted.
Answer: B
A symptom of many viruses is unusual activity on the system disk. This is caused by the virus spreading to other files on your system.