Hey everyone,

I just got a new 18TB Exos drive, but I'm having trouble getting Unraid to detect it when it's installed in the drive bay.

Here's what I know:

• The drive bay works, because if I swap in another disk, it gets detected without any issues.

• The Exos drive also works — I can see it in Windows, and it shows up when I connect it via a SATA-to-USB adapter on Unraid.

• However, when I plug the Exos directly into the drive bay (using the standard internal SATA connection), Unraid doesn't detect it at all.

Any ideas on what might be going wrong? Appreciate any help!

mount-olympus-diagnostics-20250820-2236.zip

Edited August 20, 2025Aug 20 by JoNBoYuK
update to post

Try with a Molex to SATA adapter, in case it's the 3.3v issue.

thing is it is a sata and molex backplane on the Jonsbo N5 i have unplugged all the sata and have just as molex only and still nothing

7 minutes ago, JoNBoYuK said:

thing is it is a sata and molex backplane

That doesn't mean it's not supplying 3.3v, I have one that does it, so the best test is outside the backplane with a molex to SATA, that cannot have 3.3v

ok ill report back thanks

nothing straight from mobo sata also from HBA with sata then molex to sata no luck even did a full restart

just in case this is wrong and has 3.3, i dont know if this matters but the driver does turn on spins either from backplane or with molex adaptor

Edited August 21, 2025Aug 21 by JoNBoYuK
dd

The molex adapter cannot have 3.3v, and if the drive spins up even on the backplane, that's not the issue, can you connect it to a different controller, using the backplane or the adapter?

still nothing ive tried everything it just wont show on unraid no matter how i try but like i said it shows up if connect via usb and is working on windows PC!!!

Update: Magically, the drive is now detected when I swap the bay! But now there's a new problem—one of the drives is showing as disabled, which is just fantastic.
Here's what’s happening:

• If I swap the drive in Bay 10 with the one in Bay 5, both drives show up.

• But if I swap them back to their original positions, then only one drive shows up, and the other (the new one) doesn’t appear at all.

How does that make any sense?

Strange, but if works in those positions, leave it like that. You will need to rebuild the disabled disk, but make sure the emulated disk is mounting before rebuilding on top.