I think it is ok now:

What is next ...?

Copy files to the files folder, you should be be able to do this from thunar

To "file folders"? -- i'm trying to copy in Thunar but from my system/'documents' to into 'Data' but I got an error ...(and it is mounted):

https://www.linuxquestions.org/quest...1&d=1703883090

I'll be back tomorrow. Thanks.

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You are attempting to copy folders to the top of the data partition, can't be done as a user unless mount permissions are set. You need to copy the Documents folder into the files folder on the data partition.

If want the Document folder on the same level as the files folder you will have to do this for each directory you are attempting to copy directly to the data partition.
Then copy the contents of the Documents folder to /media/keos/Data/Documents.

Setting permissions for all users to write/access files to the top of a partition tree is done by setting the permissions of the directory where the partition is mounted, easily done on an installed system not so much on a live iso system. This permission issue would be bypassed if the partition is formatted exfat or ntfs

The system automatically mounted the partition to /media/keos/Data and the OP manually mounted it to /mnt

You need to change the permissions of the mount point otherwise you can not create any files or subdirectories by just drag in drop. The permissions are written to the filesystem so change one mountpoint should allow writing to the other.

True, now I think about it. I guess the opp could change the permissions of the mount point on the installed system with The problem is the op would have to chmod 777 the mount point of the partition each time the partition is mounted in a live iso.

Permissions are attached to the filesystem (i.e native linux filesystems) and the OP is using ext4. With 777 the data partition should be writable regardless. Granted, it works with installed systems but I have only tested on one live ISO, LMDE but I don't know why it would not work on others.

A directory can have any sort of permissions but when used as a mount point will change to the permissions of the mounted filesystem (again linux native filesystems).

As you may have noticed I am just a user not versed in these technicalities so I deduce that perhaps the most practical for me is:

Isn't that right?

Now I tried to do it again in Thunar but as 'root' and it worked, the documents are already in 'Data'



-- but when going to ventoy to the F2: Browse option, to search for them, they are not there, only 'the names' as in post #61

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When booting the MX iso on the usb drive, you need to mount that Data partition before any of the files will be available which of course, will likely require root (sudo) permissions. As I understand it, the MX on the usb drive is a 'live' Linux iso and will not automatically mount that partition which from your earlier posts appears to be sda3. If you boot MX on the usb drive, copy and paste the following command into a terminal. It will not change/modify anything but simply output information:

Do you see an entry there for sda3? Not likely, which is why you need to manually mount each time. The MX iso on the flash drive is a 'live' system which means it is read only and you cannot modify system files.

On a Linux system, you generally need root (sudo) permissions to access anything outside the user /home /directory and mounting is also generally done using root (sudo).

An example would be to simply run: sudo mount /dev/sda3 /mnt
That should mount the DATA partition at /mnt and make it available and you should see any data you copied from your installed OS.

Support for NTFS and exFAT depends on distribution version as well as kernel version. The main stream distributions usually include support for exFAT and NTFS but may or may not be included by default in the live version. Both filesystems are becoming builtin and in the future are probably going to require the same permissions as regular filesystems so I can not guarantee they will be automatically mounted with r/w for a regular user.

Your screenshot appears to show the same directories but not the contents so I can not tell if they are empty or not.

Are you telling me to go in ventoy to the operating system, and from there, open a terminal and run:

--and this has to be done every time I want to access the Data?

This is from inside the ventoy/mx-23 USB:

Data' is automatically mounted when I open the system (USB) and it appears in Thunar, but not in Ventoy/F2:Browse. (?).

Are you talking about this: https://www.ventoy.net/en/doc_vlnk.html see bottom of webpage for example

The f2 key in ventoy boot menu will only display directories and iso files.

I guess it depends on the distribution. I have only tested two live versions, MX and LMDE. MX running from Ventoy does not automatically mount the data partition but it is automatically mounted with LMDE.