I wrote the command that you told me in a Terminal and these are the results:
internet@doryforos:/media/cdrom0/linux$ lsof|grep cdrom
bash 7185 internet cwd DIR 22,64 2048 52416 /media/cdrom0/linux
lsof 8132 internet cwd DIR 22,64 2048 52416 /media/cdrom0/linux
grep 8133 internet cwd DIR 22,64 2048 52416 /media/cdrom0/linux
lsof 8134 internet cwd DIR 22,64 2048 52416 /media/cdrom0/linux
Now what am I supposed to do??