NTLDR on first SATA drive?

Before installing Windows 7 on a fresh new empty 500 gig drive, I seem to have mixed up SATA1 and SATA2.
The drive accidentally sitting in SATA1 position was a Terabyte drive used on my last system, a Vista system I fried.

Once I noticed my mistake, after the Windows 7 install, I switched them so that the boot drive can be SATA1. When I went to reboot, the message was "can't find NTLDR", so I assume that important file is on the terabyte drive, which I want to format now that I've moved my files to the new drive.

IT won't let me format, which is another reason I think some important files landed on the terabyte drive.

What can I do to change this so the Western Digital Terabyte drive can be formatted, and the boot drive can sit at the SATA1 position?

Thank you in advance for any help.

Please post back a screenshot of your full Disk Management drive map and listings, using SNipping TOol in Start Menu. Tell us what is on each partition and what you what to end up with.

Make sure the WIn7 HD is set as first HD to boot in BIOS setup, or swap the cable from DISKO to it when you unplug DISK0, which contains the System Active boot files for Win7, and DISK2. THen boot your Win7 DVD to run Startup Repair up to 3 separate times as shown in tutorial above.

After Win7 boots, power down to plug back in the other two HD's, then boot the Win7 DVD press Shift F10 to open a Command Line to mark them Inactive using the Diskpart commands given in this tutorial: Partition - Mark as Active The only difference from the steps given in tutorial is you will be marking the Active partitions on the two non-Win7 HD's Inactive instead of Active so that they can't derail your System MBR from Win7 again.