I deleted some files from my 3TB Western Digital My Book and tried to use Recuva to get them back but it doesnt seem to like the large drive as I get a "Unable to read MFT" error when doing a quick scan, when I try a deep scan it seems to hang and do nothing. I also posted an issue with Defraggler not being able to recognise large drives so could be related. Maybe it doesn't like the 4k sector formatting of newer large drives.