Thanks for your quickly answer...
My nas has 2 3TB WD disk, in mirror configuration, so I've near 3TB disk space. There are only 60 GB free. Largest part of the files on disk, probably some thousands, are .jpg (photos, about 3-5 MB each one). There are also a lot of .m2ts video files, all greater than 1 GB, and approx 300 GB of other kind of files.
I've started a refresh before write my previous post (36 hours ago) and nas is still at 65% of job.
I'm really unhappy listening for no new FW, it's incredible that I've to wait for up to 50 hours to update the media server...
Thanks
Carlo