Hello,

Im very new to Linux and today I decided to open an old photos cd-rom on my laptop. To do that, I learned about file systems and that I had to mount the cd-rom before I could open it's photos. I did it and it worked all well, and then I unmounted it so I could use a different cd. The problem is that everytime I insert a new cd it is automatically mounted, which I cannot understand why. Wasn't I supposed to mount it again every time I change the cdrom in the driver? I mean, that's what I learned. I already checked the fstab file to see if it was set to mount automatically but it's not.

Glad you're learning Linux! In most modern distributions, you do not have to manually mount a CD or DVD that you insert. In fact, I'm surprised you had to do it that first time?

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What version of Linux (distro) are you running and what desktop? Some of the desktop environments mount removable drives automatically.

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Thank you for the very fast replies!

Yes, in the first time when I pluged the cd-rom driver on my laptop I couldn't see its cd content available, so I had to mount it to be able to see it (I dont't know if it has something to do with the fact that this is a usb cd-rom driver because my laptop doesn't have one as most modern ones). But after mounting it for the first time, the process was automatic. I just had to unmount the current cd, put another one back in the driver and then it was automatically mounted with the cd contents available.

I use Debian 10

Once you plug in the USB CD ROM drive, the command will tell the name of the device that has just been plugged in. Your need to mount before seeing the first compact disc is necessary due to the system having to deal with the new USB device. Once the drive(-r) is actually mounted, the behavior will be the same as any other CD ROM. That is how it is no longer necessary to remount for each disc you would place in the drive. Mount works with the file /etc/fstab. USB devices should not be listed in this file as these devices are removable and the system cannot know if the device is plugged in at startup or not. Hope this helps.

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It helps a lot! Thank you very much! Just one more thing: why once I mounted it I don't have to mount it again EVEN if I use the umount command?