Hi

I had the same problem, but I install all new, the Knoppix 5.01. But I think is exactly the same problem.

When I did click on partition hda1 or DVD or floppy disk icon the system show a mesagge like: "Imposible mount, not acces permited" or something like that.

Well, I do this. First, if the message say "Unautorized acces" or something like that, that means that you don't have permission to use that device. In your fstab file you can change that at fstab file. (users instruction need)

fstab file is a very important file, for that first make a backup of fstab file, and be sure to have a boot floppy disk (at install if possbile to create), only for security. But whit my steps is difficult make a mistake, but be sure..

In a root conseloe or session writte

cp /etc/fstab /etc/fstab.backup

that you have a backuo of your fstab file, callend now "fstab.backup", then writte

nedit /etc/fstab &

with that instruction you go to open the file fstab whit nedit editor; of course you can use the editor that you preffer.

When the fstab file is opne, you can change some lines, but BE CAREFUL this is a very important file.

this lines that ia have in my fstab file

/dev/cdrom /media/cdrom iso9660 defaults,ro,users,noexec,noauto 0 0
#/dev/cdrom1 /media/cdrom1 iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/dvd /media/dvd iso9660 defaults,ro,users,noexec,noauto 0 0

see that on cdrom1 i put a # at the start of the line, that means that line doń t work; i didn't erase

and at the end of this file I wrote

#Added by GRUS
/dev/hdd /media/cdrom iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/hdd /media/dvd iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/fd0 /media/fd0 vfat defaults,user,noauto,showexec,umask=022 0 0
/dev/floppy /media/floppy vfat defaults,user,noauto,showexec,umask=022 0 0
/dev/hda1 /media/hda1 ntfs auto,users,exec,umask=000 0 0

of course you are interested only in CDROM and DVD lines, but I had problems with floppy, hda1.. etc... Still my hda1 don't work, but floppy and CDROM / DVD work fine

I recomend read something about fstab first, at google you can find much information, to learn what means ro, users, no auto etc ...

ro= rean only
noauto = don't mount automaticly

That work for my, I hope work for you too, but I want to insist, fstab is a very important file, create a backup.
sorry my english, i'm from Mexico