W2K: why is harddisk accessed during dvd playing

[Joseph Mack NA3T]

I'm playing movie dvds (,VOB files I think) with Matrox Cine 
Player on both a desktop and a laptop on W2K. I expected the 
dvd access light to be on most of the time and the hard disk 
not to be accessed at all. Instead the harddisk and dvd 
alternate, with the harddisk working really hard (from the 
noise it's making). I expect this will slow down dvd 
playing, if not shortening the life of the harddisk.

The desktop machine has 768MBytes of memory. I would have 
hoped that was enough for any tmp space to play dvds.

The desktop machine did have a virus checker, which I 
deinstalled, without any change. The laptop doesn't have a 
virus checker.

Anyone know what's going on?

Thanks Joe

-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml 
Homepage http://www.austintek.com/ It's GNU/Linux!