Those Seagate drives should work. You will need an image and DvrBARS to restore it. Let me know what size you drive you want to use and I will send you the correct image. You can find DvrBARS in the Upgrade forum.
You can get it running without a subscription, but it won't do anything except tune in live TV.
You can get it running without a subscription, but it won't do anything except tune in live TV.