New Drive F4-423

[NasMan]

I've been running a single 4TB drive in my F4-423 for a while in TRAID.

I bought a new drive and added it in while the NAS was running. The light for drive 2 is on, but it does not show up anywhere in the control panel anywhere.

All options under storage pool are disabled.

What am I doing wrong? Some screenshots below

https://imgur.com/a/jX9jWsp

[Gremlin]

The logical answer is that the new drive has not been 'seen' by the system as installed.
Properly inserted in Tray? Properly inserted in slot? Fully inserted?
{I can tell you that it is possible to install drive the wrong way around in tray and for it to appear to be inserted fully into slot... }

[NasMan]

The drive is in correctly. Interesting your’s allows it to go in the wrong way. Mine doesn’t.

The light is also on, on the front of the NAS.

Baffled as to what it could be.

[RyanYang]

Have you tried using other slots? If you have, you might also try switching the slots of the new and old hard drives, then restarting to test.
It’s possible that the slots that weren't previously used have oxidation issues.
Of course, it could also be a problem with the hard drive itself, so you might want to try using a different drive for testing.