I am just ignoring all the errors this week as I assume they are operator induced
How I managed to have all the file names (shown under info on the PRS-600) having the calibre folder number appended to them is beyond me.
Now I have a kindle 3 which I got for my mother and it seems to induce add_book errors.
My mantra of the week is if you get it on the reader and read it, who cares what it is called and how it is sorted.
My brain obviously needed a holiday and will be back in town eventually