Enable Host I/O Cache in VirtualBox

My host operating system is Ubuntu 10.04 (Lucid Lynx).  When starting or creating a Microsoft Windows Vista guest operating system in VirtualBox, I am presented with the following screen:

Indeed, my default file system is ext4 so what do I do about this nagging screen?  Well, I could do the simple thing of clicking in the box to the left of “Do not show this message again” as seen in the screen shot above.  However, I'm a bit of a paranoid control freak and I don't want to later forget that I did that, just in case there be any related future issues.  So I am content to do the following:

In the “Details” view of my guest operating system,

I shall click Storage which brings me to:

My IDE Controller is for my CD/DVD devices.  My hard drive is connected to a SATA Controller so

I select “SATA Controller”.  To the right I see a blank white box to the left of “Use host I/O cache” which I click.

Then I click the “OK” button in the lower right corner and I'm good to go.  Now I start my Vista guest operating system and I no longer get the nagging pop-up warning, and I can go back and uncheck the setting any time I need to.  Whoo-hoo!