Option 9 "fsck" is a repair tool that checks file system consistency and interactively repairs the file system and is similar chkdsk, read link for more details http://en.wikipedia.org/wiki/Fsck and http://en.wikipedia.org/wiki/Chkdsk
If files being transferred while Source drive failed then you will have broken files during the transfer and very hard to determine during that time of which files completed. Again do you have a backup to restore from (Tape, Snapshot or another backup procedure) if so restore the files. If you go to the NAS Resources and select the share then click on the down arrow button associated with the path then select the LV000x to access or delete the lost+found dir.
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