Windows Vista, DVD-R Destruction

When I take a disk recorded in my stand alone HDD/DVD recorder and try to play it in on my Windows Vista Ultimate PC, sometimes Vista destroys the DVD in such a way that it won't play afterwards in either the computer or on the DVD player.

• I have a Sanyo HDD/DVD Recorder which does an adquate job of recording some of my favourite Television. Occasionally, I archive recorded episodes to DVD.
• I have a Windows Vista Ulitmate PC with 2 LG DVD drives which I occationally use as a media centre.
  

There is no pattern to this behaviour, but having investigated the resultant corrupt disk using ISO buster it appears that Windows Vista is falsly recognising the inserted disk as a "empty" (or something) and writting a second "NULL" session to the disk (effectively erasing the disk). Oddly, when the disk is inserted into the HDD/DVD recorder afterwards it says : "No Disk". It also claims their is "No Disk" when inserting it into the PC (though ISO Buster, being an excellent tool, is able to see the original session).

The odd thing is, this doesn't seem to always happen? This always worries me because most commonly in my experience inconsistant issues are a result of user error? Though, I fail to see why any action of inserting a disk (without any specialised software running) should cause a recordable DVD to be effectively destroyed for normal use!

Fortunately, this issue does not unduely concern me as purchase all the movies I like and I haven't lost a recording I could not replace.

It seems Microsoft provide a very poor solution when it comes to built-in DVDR/CDR support in Vista. Microsoft do manage to present a simple interface to DVD/CD writing but this is entirely ruined by the fact that it can cause loss of data when using non-Microsoft software written DVD's.

Shame on them!