Switch system volumn in windows 2008 R2

First, here is the definition for system volume and boot volume under windows.

Second, here is step to change system volume from HDD3 to HDD1.

1. The boot files consist of a folder called "Boot" and an application called "bootmgr". They are system files, and so are normally hidden. You must make them visible.
2. Copy them both from HDD3 to HDD1. It will complain that two files cannot be copied: "BCD" and "BCD.log", both of which are in the "Boot" folder. The latter is unimportant (its just a log file) and can be ignored; the former will be copied in the next step.
3. Open a command prompt with Administrator privileges. Type the following command "bcdedit /export HDD1:\Boot\BCD", where HDD1 is the driver letter of your destination drive. In my case, HDD1 was C, so the command was "bcdedit /export C:\Boot\BCD".
4. Now, you have to edit the BCD file so that the entries are all correct. I used the bcdedit program which comes with Windows 7, but there are others. I've heard EasyBCD is pretty good (and free), but the latest version doesn't fully support Windows 7. I believe a new version that does support Windows 7 will be out shortly. First, I navigate to HDD1\Boot on the command prompt (with Admin privileges) and type "bcdedit /store BCD /enum ALL". I use the /store switch to specify the BCD file in the current directory - omitting this switch will use the default one I think, which is on HDD3. This command lists all the entries in the BCD file.
5. I scanned the entries, and it turns out that the entries for {bootmgr} and {memdiag} both point to HDD3. Of course, I want them to point to HDD1. So I issue commands in the following form: "bcdedit /store BCD /set [entry name] device partition=HDD1:". Since HDD1 is C on my machine, I would type the following to set the {bootmgr} entry: "bcdedit /store BCD /set {bootmgr} device partition=C:".

That's about it. One last step is to make HDD1 Active via Disk Management (accessed from Computer Management) - it was already Active on my system, so I didn't have to do anything.