VBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per second [FIXED IN SVN]
I've noticed strange drive access patterns when running VirtualBox 4.0.2 on Windows Server 2008 (a clean install with only service packs and updates applied) and used Microsoft's Process Monitor to see what's going on. It turns out that VBoxSVC.exe and VirtualBox.exe load VBoxC.dll several times per second, read a couple of bytes and then close the file again. This happens with 4.0.2 and 3.2.12, it does *not* happen with 3.1.0 which is the version I've used so far. This only happens when a guest is running (a linux version in my case, I've not tried any other). If no guest is running the file is not loaded again and again.