The Question is:
We have copied a DAT file to tape and then back to disk.
When i tried to copy the file from disk to disk i recieve.
-RMS-F-PLG, error detected in file's prolog (reconstruct file)
Do you know what it mean ?
The Answer is :
The OpenVMS Wizard will assume the PLG error arises from the input
file, and not for the target. Please verify with a TYPE/PAGE or
CONVERT /FDL=NLA0: badfile NLA0: or similar command.
Is this an Indexed file or a Relative file?
The error message suggests that the file is corrupt after that restore.
One of the easiest explanations for this involves an input file that
is marked as /NOBACKUP, of course. It is also possible that use of
BACKUP/IGNORE=INTERLOCK resulted in this corruption, as that command
will override the file data consistency and integrity interlocks.
You may want to try the restore to a different target disk and using
a different tape drive, of course, as this could be a disk or tape
For further analysis, you will need to use tools like ANALYZE/RMS and
DUMP/BLOCK=COUNT=10 to determine if the binary structure of the file
is valid and correct. You can compare this with a working version of
You may wish to learn the details of indexed file structures by reading
the OpenVMS Guide to File applications. Should the file be exceedingly
valuable, then perhaps check out the File Patching section available in
the rms_tuning presentation in the OpenVMS freeware V5.0 rms_tools
directory. Also consider a data restoration service.