I currently have a two bay nas with 2x4TB HDDs in it. My problem is that i need more space. I dont want to buy another 4TB HDD and a 4 Bay NAS or a 8TB HDD to replace one of my 4TB HDDs since both options woould be pretty expensive.
I know that a SATA port can only be connected to one HDD.
So here is my question: Is there a device/controller that i can use to combine two HDDs into one logical drive, that i could then connect to one of the NAS Bays. If the controller emulates a Singe drive, then connecting it via one sata connection should be possible, or am i missing something?
Are there devices that are available for sale, that have that functionality?
If there is not, is there a way to build something like that myself?