Pioneer 640HS - can you HS copy DVD authored on PC to HDD?

I've got several AVI clips on my PC that I would like to convert to MPG and burn to DVD on my PC and then high speed copy from DVD to HDD on my Pioneer 640HS. I know I can leave these on the DVD and just watch them that way but I would prefer to watch them from the HDD so I can use the commercial skip feature as well as avoid the noise associated with the DVD when the fan comes on (I'm very noise sensitive). Plus I don't want to hassle with all the DVD swapping and want to be able to select what to watch from the HDD and delete when done. I know I can do a "one touch" copy to get them to the HDD that way but that is in real-time and would like to go the faster HS/lossless mode if possible.

I've done a ton of reading here and on many popular sites like VideoHelp and so far haven't found an answer to this problem. I know you can only HS copy to the HDD on a non-finalized -VR mode DVD-RW. I've tried several different software applications to create such a disc, most notably Nero Vision, but always get an error message from the 640 when trying to do the HS copy: "Could not high-speed copy titles that include incompatible audio format, etc." I've verified that the converted MPG file is DVD-compliant, and audio is in correct format. Have tried many different DVD-RW manufacturer discs and speeds but no luck there either.

I can record from the 640's HDD to a DVD, then copy it back to the HDD in HS mode, so know it's possible, but doesn't appear I can author a disc on my PC and then copy to the 640 HDD in HS mode.

Anyone had an experience with this and/or know if it's possible? I might be missing something really obvious, or perhaps it's widely known that this can't be done, but I'm stumped at this point.

Thanks for the suggestion. I just did some testing and it wouldn't allow me to make a backup of the -VR mode disc (finalized or not) but did allow me to back it up if I wrote the DVD in video mode. Once backed up though I couldn't access the resulting file(s); I could only copy it back to a DVD. Looks like it "hides" it in some kind of partition that you can only access for backing up purposes.

What's strange about the apparent audio differences is I looked at the VRO file created by the 640 in Gspot and it looks like standard AC3 audio which matches up with DVD files I've created. Since the error message has "etc" in there makes me wonder if it's something video or structure related (again, couldn't see any obvious differences comparing the two in Gspot).

Good stuff, thanks for the replies. Sounds like what I want to do is not possible, at least without getting super technical and spending a lot of time. I did find a product called B's DVD Gold8 Recorder that appears to support the Pioneer 510 model but am not sure what exactly is meant by "support" on their website. It may just mean that it can read their format and not necessarily write it to where it would support high speed copying. I did email their tech support and will post here if I hear anything back.

Ben