extend file system

[Jerry Geis]

I have an OLD dell with 2T Raid-1 disk in slots 1 and 2. 3 and 4 are empty.

I also have two more OLD disks from another dell that died.
I would like to put the two disks into the working Dell and desire to make
the file system look all the same. "Continuous"

so right now /dev/sda1 (from the RAID-1) is mounted as /
I can put in disk 3 and format as ext4 - same with disk 4.

But I don't know how to tell the system that all those should be
"continuous' '.
Its all just backup data - nothing special. Just looking for all continuous.

Is that possible? How.

Thanks!

Jerry
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