I successfully migrated my OS and files to a new SSD. I changed the boot order in the UEFI BIOS and now I am currently on the new SSD. I still have plugged in and letter changed the old drive with all the original information on it. I want to keep it to carry on using it for other storage means, so that would require me to format the drive.
Can I just go straight ahead and format it right now or are there additional steps required? I've been looking around and some people say it's fine, while others say not to format it. Additionally if I were to format it, disk management doesn't allow me to touch the old recovery partition..? What would I have to do to format this as well?

https://i.imgur.com/6k53Ln9.png - Screenshot of Disk Management if you need (Disk 2 is the old one and Disk 1 is the newer)