Playing media from a different drive letter

This project was shelved for quite some time, but is now picking up again.

Here is my setup:

FMS 4.0 installed on a C: only 65GB available

I want to store media on the I: as there are 300GB available

For whatever reason I can not make this work.  How can I get the media to play from a different drive other then the install drive.  When I play the media from C: all works fine, but this is not a practical solution since the drive is too small to store media.

I have edited the application.xml as below (adding <Streams>/;I:/webroot</Streams>), but it did not help.

application.xml

    <StreamManager>
        <VirtualDirectory>
      <!-- Specifies application specific virtual directory mapping for recorded streams.   -->
            <Streams>/;${VOD_COMMON_DIR}</Streams>
            <Streams>/;${VOD_DIR}</Streams>
      <Streams>/;I:/webroot</Streams>
        </VirtualDirectory>
    </StreamManager>