.
It's not an optical drive, not a mounted DVD.
Nevertheless everything is fine:
This warning was not appearing with the previous betaOpening dvd files on harddrive at I:/VIDEO_TS/
Calculated BUP offset does not match one in IFO header.
Calculated BUP offset does not match one in IFO header.
Title #0 was added (12 cell(s), 1:29:05)
Title #1 was added (12 cell(s), 1:25:32)
Operation sucessfully completed