> RC> No.  The DIR command simply _reads_ the disk.
 > OK, but what type is those viruses that gets active when you execute a
 > command such as DIR A:  I know that there is some viruses that works
 > like that.
Such viruses don't exist.  They're an urban myth ... like email viruses
and alligators living in the New York sewers,
As Rick said, the DIR command _reads_ the disk.  It can _read_ virus
code into the DOS buffer where some antivirus programs will detect it
and warn you that it's there ... but there is no way this code can
escape and "do" anything.
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