I don't believe during the core 2 Duo days terabyte hard drives were a thing or at least all that common. I know I was upgrading with 128 and 256 GB drives. So that is very possibly and upgrade itself. But unless your laptop is your main system where all your data has to reside. Or you're going to be using it for mobile video editing? Which would be pretty sketchy with a core 2 Duo. I'd honestly recommend getting a 256 GB cheap SATA SSD toss the two terabyte drive in a computer on the network to share it with the laptop if you need the storage. That's what I've done with the laptop I use. Though it's new enough to have nvme storage. But all my other data is shared over my local network via NFS