If the drive is already mounted you should not need to initialize it,there may be a option under mount manger to format the drive,this should give you the option to set partitions.In the image somewhere there should be a option in the menu to "Customize".You may have to set this to expert.Then hopefully you will see a menu for Recording paths,have a look in here,see what it is set too.
Just one thing,at the minute with the HDD mounted if you press the record button on the remote what happens???
I get a message saying "No hdd found or hdd not initialized".