3 bay and 4 bay no disks detected

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paul7290 wrote:
The firmware is 4.2.31 but I’m wondering if I need to change it as it’s got 30tb in it 

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4.2.31 firmware can't handle 3x8TB+1x6TB XRAID. XRAID can't expand over a 16 TiB volume threshold. So if you want a single volume, you will need to convert it to OS-6.  Another alternative would be to switch to FlexRAID, and create two volumes - a 3x8TB RAID-5 volume, and a 6 TB RAID-0 (jbod) volume.  This would give the same capacity as 3x8TB+6TB XRAID, but you'd be giving up RAID redundancy on the 6 TB volume.

But it is important to make sure we know the model number, as some 4.2.x NAS models (in particular the NVX desktop NAS and the rack-mount 2100 v1) can't be converted to OS-6.

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paul7290 wrote:
 saying 2 bays are working and the other two have no disks

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That is a bit different from the expansion limit above.  The NAS should detect all four disks, even though it can't really use them all in XRAID.  So we do need to troubleshoot this problem.

Did you ever have 4 disks working in this NAS before?  If you did, how long ago was it?  Can you tell us the disk models?

Try doing a factory install with one of the erased disks (leaving the others out).  Just put that disk in the NAS (powered down), with the other bays empty.  Then powering up the NAS should do the factory install.  Then set up the NAS with just the one disk in bay 1.

Then try booting with that disk in the other bays (powering down, moving the disk, and powering up again).  The NAS should detect the disk and boot up in all four slots.  

Let us know the outcome of that test, and we can then proceed further.

Can you give a better timeline of what you have done and what has failed?  Your initial post is confusing, saying both that you've formatted the drives (which means the NAS could see them) and that the NAS can't see them.  It's also unclear if you are starting will all new drives or adding them to an existing array.

Is this NAS new to you?  Do you know all bays worked before you started this process?

You still didn't say which NAS you have.  I'm guessing it's a 4-bay, but there are several models of that and the advice we give may differ based on it.  For example, some can be upgraded to OS6, but others cannot.