As with other devices, the storage presentation order during discovery have fixed order of USB port scanning .
Keep these in mind when you have multiple disk towers.
I have 1 32TB Mediasonic Proraid
And two towers of 4Tb x 8 bay raids attached to my main Himedia q10 pro.
You would think a Sata will be discovered first then the USB devices next.
The trick is to remember which USB disk plugs to what port so Kodi can cleanly update the library with the correct drive paths sda , sdb,sdc
Dealing with changing disks :
If the order of presentation of disk is an issue
Or you want to use multiple disk to be presented as single video source , add the video source per path
Example
/Nmt/sda2/movies
/Nmt/sdb2/movies
:
:
/Nmt/sdf2/movies
Video source : 64TB movies remux
This way when you update library it will read all disk contents on /movies path , and "merge" them under one video source
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