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Comments on Secondary internal disk is mounted as an external disk

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Secondary internal disk is mounted as an external disk

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I just installed an SSD into my motherboard's third M.2 slot. After I booted up the computer, the secondary disk is now displayed like an externally connected one. There's an icon for it on the desktop, in the dock, and I can unmount it wherever I find the icon. If I drag files and folders between the disks in Nautilus, they are copied, not moved. I assume the OS should not treat an internal disk like this.

Screenshot of the disk icon on the desktop Screenshot of the disk present in the dock

Screenshot of both the disks in Nautilus, displaying a mounting location and an eject button for the secondary one

Additionally, there's an "unmount" action in the context menu for "Secondary 0", but not "Computer". I'd show a screenshot, but taking a screenshot doesn't work while Nautilus is presenting a context menu.

If this is not how internal disks are supposed to be handled, why is it happening? How do I fix it? If, on the other hand, it is by design, how do I make it not appear like an external one?

The disk already contained data that I need, when I installed it, and that is more data than I can move to the main disk, so any sort of reformatting is out of question.

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Open the Disks application. Select the secondary disk and partition, and in the gears menu click on Edit Mount Options...

action menu of a volume in the Disks application

Uncheck User Session Defaults and uncheck Show in user interface.

Mount options of the volume

Optional: select a Mount Point you can find easily. The disk will not only not be shown in the dock, it will also not be shown in the file manager anymore as a separate drive, you will have to navigate to the folder yourself.

You can drag it to the bookmarks for easier navigation:

file manager window showing mount point icon dragged to the bookmark section

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3 comment threads

What does "Identify As" mean or refer to? (6 comments)
Not specifying a mount point (3 comments)
Boot disk (3 comments)
Not specifying a mount point

In case I choose not to specify a mount point, what happens then? Is the disk mounted in some directory somewhere within system directories, and I have to track that down every time I log in, and the name of the mounted directory may change between each boot?

That said, the mount point input box is already populated with the existing mounting point.

GeraldS‭ wrote 3 months ago

I did not try it, but my guess is that if you leave it empty it will be mounted in the same default location as it is mounted now. If you are fine with the location currently shown to you just leave it as it is.

matthewsnyder‭ wrote 3 months ago

I believe the OS will simply come up with a "reasonable" location to mount it at. I believe that the "standard" place (based on FHS/XDG recommendations) is something like /run/media/USERNAME/UUID/. So if you're going to access the drive often and don't want to be typing that /run/media stuff, you can specify a custom mountpoint like /my-drive/.

I think some distros use a different default, so it might also get mounted at /media/... or some other place. After mounting, if you select the partition in Gnome Disks, it should show you where it's mounted.