New build old Mac hard drive availability in New Build area
New build old Mac hard drive availability in New Build area
You could, but there isn't really a point, and depending on how old/used that drive is it could be risky having any data on it. A new 1TB drive is like $50 or something, I'd just spring for that tbh. But yes, you could absolutely have an SSD with your OS and programs on it and a larger HDD for games and stuff.
Yes, you can isolate the hard drive for booting. Keep the hard drive separate, shut down the PC, then restart it using the Windows drive as the boot source.
You're likely trying to start MacOS from your new PC. That approach won't work directly unless you're modifying the system in some way. Don't assume the drive will boot normally without changes.
It won't start by itself, though a custom build might work. You lose previous files, and the whole setup is quite involved.