User guide
VERIFY
VERIFY allows
you
to
check the accuracy of the data recorded
as
a video image. Verify is similar to the restore, but it does
not
write
the stored data back to the disk. Verification is accomplished by
CRC checking, not by comparison
to
the disk data. After reading
the image, it reports the status
of
errors encountered and indi-
cates whether retry passes
will
be
needed when data
is
restored to
the drive. If you wish
to
ensure data accuracy when blocks
cannot
be recovered in one pass, it is possible
to
do one
or
more retry
passes
following a restore.
By using the error status reports given when you use the verify
function, you can
evaluate the quality
of
different video tapes and
tape recorders.
If you need
to
use a VCR other than the one you used for the
backup, a verify pass
of
a
short
image will reveal how closely the
tracking
alignment is adjusted between the two decks. This will
tell
you
if
it is possible
to
restore data using
an
image backed up on
a different VCR.
IDENTIFY
IDENTIFY
reads then displays the file header that
is
included
when
an
image
is
created. It is used to determine the tape position
of
timage.
An image header contains information such as the image size,
the host computer system that produced the image, and informa-
tion you
supply when you record
an
image.
Software Interface
to
the Mirror
The Corvus disk controller firmware controls
Mirror
operations.
A host computer sends commands
to
the disk controller
through
the
Mirror
utility program. These commands perform the
Mirror
operations.
MIRROR SOFTWARE OPERATES PROPERLY
ONLY WHEN A TAPE
IS ACTUALLY IN THE
RECORDER.
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