I also had a bit of a problem with this.
Having put this in my tvixhd1 folder, the DVD (original R1 Hellsing Ultimate III, playing the DD5.1 Japanese track w/English subs) starts off perfectly, but after about 30(?) minutes first starts stuttering, then plays visually fine, but with no sound. Rewindingwould result in normal playback for a minute or two, then stutter ending in no sound. Using fairly recent build of AnyDVD.
Also, after this the tvix wouldn't play .wmv-files (skipped to first .avi it found), trying to restart the DVD resulted in a black screen. Needed a reboot to get both to play.
I'm playing the DVD again to see if it's reproducable.
Would this work as an easy way to add access to (media on) other HDDs to the tvixhd1 folder? Anyone tried? Any reason not to?
Edit; Tvix M-5100SH running beta fw1.25.
Edit2: It happened again, but this time the tvix locked up.