Disks spun up when array is not online

[TapRackPull]

Forgive me if this has been asked or explained previously, I couldn't find an answer to my question. Recently I took my array offline and was amazed to find that there the 4tb drive,which UnRaid did not have in the array and showed as disabled was spinning. That led me to wonder why any disk in an array not in use and not online, would even be spun up? Is there a setting I am missing? It seems if you take the array offline, you should be able to pull a drive and replace it without it trying to gyroscope out of your hands. Is Unraid 6.1.9 not warm swapable? Could this be changed in future iterations of the Software?

 

Thanks,

 

Matt