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That’s a bummer. Unfortunately I can’t think of something else since fast startup has been suggested by another user and it’s also not the case.
The drives are shown as NTFS by Gparted right? Also can you confirm that the sizes should be those sizes? As in do you remember from when you bought them? 16 TB is still a big drive. Additionally can you confirm that they are all different drives and not partitions on the same disk.
Do they show up on the file explorer sidebar or if you go to “Other Locations” (in the file explorer)? If so do you get an error when you try to access them?
If they don’t unfortunately you probably will have to use the terminal to try and mount them so we can hopefully get some error message and hopefully some clue to what is going on.
Ubuntu Wiki Ask Ubuntu Ubuntu Forums
The wiki has some information and should correspond to how Ubuntu specifically is configured. You can ask for ubuntu specific help in those communities. You can also ask here and on several Linux communities on Lemmy.
The Arch Wiki I find to be more in depth than the ubuntu wiki. Of course some things may differ from Ubuntu’s defaults but I found it a useful resource when using Ubuntu.
Finally I suggest you learn a bit about how Linux works in general, what is in what directory, what is wayland and xorg, understand how drives are named etc and some understanding of the terminal (moving around in directories, how to use sudo etc, no need to learn to make bash scripts).