Hi Emanuele,
This isn't something I've tried (I've got an R-44), but it might be worth checking the formatting of the original drive (I'd guess it'd be FAT32, but may be something like UDF) on your computer. It's probably a PATA interface, rather than SATA. Also get in touch with Edirol, they may be able to help. Let us know how you get on
Richard