I believe the 40 gig disk should work. You won't be able to use the full 40 gigs with the EOS file system though, due to the disk limit of 18 gigs. But the disk will be usable. Check the uploads section on the main page for EOS 4.7. If you can't live with the size limitation with EOS 4.7 you can format your disk as FAT if required. As far as I know there are no size limitations with this file system. Be forewarned that there are other bugs associated with EOS 4.7 that may be quite unpleasant, so use with caution.