This article is from the Computer viruses FAQ, by David Harley D.Harley@icrf.icnet.uk, George Wenzel gwenzel@telusplanet.net and Bruce Burrell bpb@umich.edu with numerous contributions by others.
If you have a clean PC system, you can't contract a boot sector virus
*or* a file virus just by listing the files on an infected floppy.
Of course, if your PC is infected, you may well infect a *clean* floppy
by using
DIR A:
It *is* possible to have a scanner report a virus in memory after a
DIR of a floppy with an infected boot sector. The distinction here is
that the virus is not actually loaded into memory, so the PC has
*not* been infected.
 
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