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32 .\" @(#)tcopy.1 8.2 (Berkeley) 4/17/94
40 .Nd copy and/or verify mag tapes
50 utility is designed to copy magnetic tapes.
51 The only assumption made
52 about the tape layout is that there are two sequential EOF marks
57 information about the sizes of records and files found
60 tape, or on the tape specified by the
63 If a destination tape is also specified by the
65 argument, a copy of the source tape will be made.
67 destination tape will be identical to that used on the source tape.
69 a tape will yield the same program output as if just printing the sizes.
71 The following options are available:
72 .Bl -tag -width ".Fl s Ar maxblk"
78 and then verify that the two tapes are identical.
80 Specify a maximum block size,
87 verify that they are identical.
89 Output all informational messages to the standard error
90 instead of the standard output.
91 This option is useful when
107 Writing an image of a tape to a file does not preserve much more than
109 Block size(s) and tape EOF marks are lost which would
110 otherwise be preserved in a tape-to-tape copy.
112 End of data (EOD) is determined by two sequential EOF marks
113 with no data between them.
114 There used to be old systems which typically wrote three EOF's between tape
118 utility will erroneously stop copying early in this case.
120 When using the copy/verify option
123 does not rewind the tapes prior to start.
124 A rewind is performed
125 after writing, prior to the verification stage.
126 If one does not start
127 at the beginning-of-tape (BOT) then the comparison
128 may not be of the intended data.