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Which drive did the computer boot from

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Win 7 (64 bit). I cloned my hard drive to a new 1TB Barracuda hard drive and now I would like to reformat the old drive. I rebooted with both drives attached, and set the BIOS to boot off the Barracuda. However, I can't tell for sure which one the computer booted off of. How can I tell which one it used?

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Look in Windows Disk Management and check which Windows partition (or booting partition, if using the SRP) is System and Boot. They should both be on the same drive (the 1TB Barracuda).

I would recommend you verify booting and Windows both work successfully by disconnecting the old drive before you format it. Just in case anything went wrong.

They both are! I guess this is because I cloned the disk. See the attached pdf. Disk0 is the old disk and Disk1 is the new cloned disk.

Attachment Size
94088-99898.pdf 179.18 KB

It looks like you should be good to go ahead and reformat the original drive.

The computer booted off of Disk 1 (Recovery is the System partition and OS is the Windows partition). Have you tested booting Disk 1 with the original drive disconnected?