The short answer is 'yes'. The long answer includes things like "make sure you don't select the wrong disk to install to" and "after you have installed and copied the data over and remove the 'extra'/'standalone' disk, Windows may not boot, so you will have to do a Startup Repair".
When I performed a clean install of Windows Server 2008 on our PowerEdge T410, with two 1 TB hard drives attached as drives 0 and 1 on the PERC controller, I did not realize that I needed to configure a RAID volume on the controller on the front end, before loading the OS.  So I need to start over.  No big deal, except that, since we don't have a tape drive, it was a chore backing up everyone's data files prior to the first install.  Question:  Prior to the second install, what if I were to add a third hard drive (I have a 250 GB), assign it drive letter "F," create an NTFS partition, and copy all my data files to it? Then, on the second go-around, I configure the PERC and set up my desired RAID 1 array using the two 1 TB disks. Of course, the disks will be completely erased.  Subsequently, when the OS install is complete, will the OS recognize my third hard drive (the 250 GB), such that I can simply copy the files from it over to my RAID mirror?  
RAID on PowerEdge T410, starting over