I asked AHEAD about this item, if they could tell me for wich use it is served, but they keep play dummy.... and told me for the Sony 500 I need to download 220.127.116.11 (JPN is 18.104.22.168 and indeed 48MB) so seen the
high MB's it must have somthing extra.
So I think it's for Japanese experimental DL temp. use, because now 22.214.171.124 is already build completely around the official Double Layer discs!
So I left curious like others.....the only thing I know, that all the DL original burners designs, and DL media comes from Japan: