Thanks, both, for all that good advice/clear direction. I'll do the copy to library would be the thing I think.
How'd I get here? It is virtually a new library. It had been sitting on this machine for yonks with nearly nothing in it. I started using this machine and decided to start again building that library. So I did a couple of disks ( 6 hard drives on this machine ) and then thought I ought to get the library off C: which was getting full.
So I moved the library, using Calibre's option, over to where it is now (J
and continued the job.
Got to the end, sort of, decided to check the thing and came up with all this.
That's all I know.
p.s. 'select all the books in the library' for 'copy to library' - I see no option to select all books - that will come up when I select 'copy to library' will it?
I'm going to have to put this on hold. I don't have enough disk space to create another library of this size. Better get another disk.