How do i change primary HDD?

I need help in how to change which HDD is my primary.

I have 2 HDDs, one old (small) 465,76 GB HDD which i suspect might fail soon, and one new (big) 1863,02 GB HDD. What i want to do is install Windows 7 on the new HDD so that i can remove the old one. I installed Windows 7 on the new HDD without problems. Whenever i start the computer i get two options, like going in to safe mode

Windows 7
Windows 7

I suspect that this gives me the choice of which HDD to start with. So far i think it seems pretty easy.

My problem comes when i enter the Disk Management program. Here is a picture

https://imageshack.com/i/exWjqF3Mp

The small HDD, has many more statuses assigned to it than the big. Does that mean that it is the primary one? If yes how can i change so that those statuses get over the big HDD.

Thanks in advance

Please boot into the new installation to post back a screenshot of Disk Management - Post a Screen Capture Image this time attaching it with paper clip icon in reply box so we dont' have to go to another site and can see it here in your post.

If it boots as C then it was correctly installed from boot and not from the old OS so you can keep it. Since it is marked Active you can unplug the old HD, swap its cable to the new HD so it takes DISK0 position, then boot into the Win7 installation media to run Startup Repair - Run 3 Separate Times until Win7 starts and the partiiton holds the System flag.

You can now plug back in the old HD to boot it if needed using the one-time BIOS Boot menu key, access its data to copy over, or just wipe it to get it cleanest with Diskpart Clean Command to repartition in Disk Mgmt.

It seems to have worked a little, i think. the drives name is still E, but the System status is still attached to the C drive.

This is because the Win7 installation media was run from the old drive which blocked the letter C from being assigned to the new Win7 as it always does when it is correctly installed from the booted media.

So your choices are to unplug the old Drive, swap its cable to the new one, boot the installation media to Clean Install Windows 7 l, deleting all partitions to create and format new.

Or if you want to try to put up with Win7 being on E you can unplug the old HD, swap its cable to E drive, boot into Installation Media to run Startup Repair - Run 3 Separate Times to move the System flag to E.

Again, when you plug back in the old HD you can boot it using the one-time BIOS Boot menu key, access its data from E, or wipe it to repartition in Disk Mgmt.

Why would the old hard drive be plugged in if you followed the steps I gave you, which were to remove it and swap its cable to the new Hard drive. Did you miss that?

If the System Active labels are both now on the new HD then unplug the old one. swap its cable to the new one, and reboot to see if it will start. If not make sure the HD is set first HD to boot in BIOS setup. If that fails then boot the WIn7 disk to run Startup Repair - Run 3 Separate Times

Yes sorry i must have missed that, I just swapped the cables. C to E and E to C.