How to unmount a CD?

[Blue]

I`ve typed:
mount /dev/cdrom /mnt/cdrom

Now I want to put another disk and I don`t know how to unmount it?
Tried eject and umount but it gives me device busy.

[aay]

First make sure you aren't currently in the /mnt/cdrom directory via a shell or graphical file manager.

Try: "umount /mnt/cdrom"

If that doesn't work try that or "eject cdrom" as root. Hopefully that should work.

[rickenbacherus]

I have gotten in the habit of doing this:

sudo umount -a

It won't umount anything that's in use (/home, /, /proc etc) but it will umount everything it can.