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TCOPY(1)		FreeBSD	General	Commands Manual		      TCOPY(1)

     tcopy -- copy and/or verify mag tapes

     tcopy [-cvx] [-s maxblk] [src [dest]]

     The tcopy utility is designed to copy magnetic tapes.  The	only assump-
     tion made about the tape layout is	that there are two sequential EOF
     marks at the end.	By default, the	tcopy utility will print information
     about the sizes of	records	and files found	on the /dev/sa0	tape, or on
     the tape specified	by the src argument.  If a destination tape is also
     specified by the dest argument, a copy of the source tape will be made.
     The blocking on the destination tape will be identical to that used on
     the source	tape.  Copying a tape will yield the same program output as if
     just printing the sizes.

     The following options are available:

     -c		Copy src to dest and then verify that the two tapes are	iden-

     -s	maxblk	Specify	a maximum block	size, maxblk.

     -v		Given the two tapes src	and dest, verify that they are identi-

     -x		Output all informational messages to the standard error	in-
		stead of the standard output.  This option is useful when dest
		is given as /dev/stdout.

     mt(1), mtio(4)

     The tcopy command appeared	in 4.3BSD.

     Writing an	image of a tape	to a file does not preserve much more than the
     raw data.	Block size(s) and tape EOF marks are lost which	would other-
     wise be preserved in a tape-to-tape copy.

     End of data (EOD) is determined by	two sequential EOF marks with no data
     between them.  There used to be old systems which typically wrote three
     EOF's between tape	files.	The tcopy utility will erroneously stop	copy-
     ing early in this case.

     When using	the copy/verify	option -c, tcopy does not rewind the tapes
     prior to start.  A	rewind is performed after writing, prior to the	veri-
     fication stage.  If one does not start at the beginning-of-tape (BOT)
     then the comparison may not be of the intended data.

FreeBSD	13.0		       December	20, 2006		  FreeBSD 13.0


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