I have a gen2 and in the 4 bays, I had a 4TB, 3TB, 3TB and 2TB. Everything was working fine until it reported a drive failure in Bay 4 (The 2TB). I have a 5N2 so I ordered a large drive for the 5N2 and took a 3TB out of my 5N2 and put it into my Gen2. Nothing happens. It doesn’t even sound like it spins up. If I take out the 3TB and replace it with the 2TB, I get a drive failure.
The 2TB is a Seagate drive so I tested it with Seatools and it passed all tests so Seatools thinks the drive is OK.
I don’t have a support contract on this Drobo because it is so old. Any ideas on what to try next? The Drobo is working fine with 3 drives, but now it makes me nervous to put anything important on it.