I have tv shows on 2 disks. One is a read only disk which is almost full. I bought a larger disk where I plan on merging the tv shows on the two disks onto the new, larger disk. I am doing this on a Raspberry Pi 4. I plan on installing the custom image first on the new disk, then copying the tv shows. I think I need to recreate the database because the tv shows are on one disk instead of two. But I don't know how to do this.
I'm not sure what you mean... you already have two disks with shows on them? Are you using the additional storage path feature?
All your recordings need to be listed in the existing database. If you have two databases from two separate dvrs, then there is no way to combine those.
If you have one dvr with a bunch of recordings, you can move some of the recordings to a new drive and then add that drive as an additional storage path.