Newbie Q - can't find harddrive under storage

Hey guys, new guy here who installed Rockstor for the first time. I’m running this off of an old PC that has multiple pre-existing drives. I used the USB stick to install Rockstor to a small SSD and now I want to make sure the NAS has the remainder of the hard drives available for storage (one 1TB and one 4TB). But for some reason, when I go to Storage>Disks, I only see the small 120GB SSD and the USB stick I used to install Rockstor. The rest of the storage did not show up, even when I clicked “rescan”. I know these two drives are properly plugged in because before I installed Rockstor, both showed up running Windows OS. I must be skipping something (like formatting the drive in some way) such that they are not showing up. Can anybody help this newbie out? Thank you!

@davidzest, welcome to the Rockstor community.
You probably need to thoroughly wipe the old windows disk before they show as available to Rockstor.

You could use these instructions here

https://rockstor.com/docs/installation/pre-install-howto.html#wiping-disks

or your preferred method to wipe the entire disks,

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