Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

  1. #1
    Join Date
    May 2023
    Location
    South of Yosemite
    Beans
    22
    Distro
    Ubuntu 24.04 Noble Numbat

    Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Hello the forum. I am trying to write an ISO of Clonzilla to a CD.
    The drive is CD/DVD/Blu-ray. Problem probably exists for all 3
    media types. The CD/DVD.. drive shows up in Drives screen and
    reports Folder is Empty. In Permissions it reports Unknown Permissions.
    The drive is good, I wrote on it in 23.xx It also reads fine.
    How do I get permission for my user account (administrator enabled) ??
    Thanks for any help.

    Stan

  2. #2
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Optical media generally can be written into just once. This is called "burning". A "master" ISO file has to be created first containing everything you want AND that ISO file must be smaller than the largest size of the blank media.

    You'll need to look at the optical device file permissions to determine if your userid is a member of the correct group that has write permissions. On my systems, that file is usually something like /dev/sr0. Usually the group would have write permissions, so you'd just need to add your normal userid to the group for the device file to have write permissions. I don't have any optical devices connected now, so I can't show the exact file or permissions as an example from my system.

    Then you'll need to use some burning software - I think Kb3 was the last software I used. It has been at least a decade since I "burned" any optical disks as either an ISO or purely as data.

  3. #3
    Join Date
    Dec 2014
    Beans
    2,641

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    To add the details TheFu couldn't provide:
    The permissions on my DVD-writer are rw- rw- --- with owner root and group cdrom. My primary user id is a member of the group cdrom and I have had no problems burning CD or DVD discs using xfburn.

    Holger

  4. #4
    Join Date
    May 2023
    Location
    South of Yosemite
    Beans
    22
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Thanks for the responses. Steps taken before my original post.

    Downloaded ISO file for Clonezilla as source for burning CD, so its on my disk. Not the problem.
    Have a supply of BLANK CDs and DVDs. BLANKS.
    I have burned CD / DVD before.
    Drive icon for CD drive STATES IT IS A BLANK CD.
    Optical Drive (CD) Right click on screen. select permissions,

    After reading the 2 responses:

    1) Located drive/cdrom

    2) brasscat@Ryzen56G:/dev$ ls -l cdrom
    lrwxrwxrwx 1 root root 3 Jun 12 11:47 cdrom -> sr0

    3) I also am a member of cdrom group.

    4) It seems I have permissions as member of group, "RWX" read write execute.

    5) Tried with K3B, can not select CD as destination.

    6) Drive screen for CD/DVD under permissions states UNKNOWN PERMISSIONS
    also: the permissions of "CD/DVD Creator" could not be determined.
    Checked "CD/DVD Creator" but does not seem to exist or I don't know where it is ?

    brasscat@Ryzen56G:/dev$ ls -l "CD/DVD Creator"
    ls: cannot access 'CD/DVD Creator': No such file or directory

    I am a little ( or more) over my head here! Please help.

    Stan.
    Last edited by BrassCat; 1 Week Ago at 11:05 PM. Reason: made more readable

  5. #5
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Code:
    lrwxrwxrwx 1 root root 3 Jun 12 11:47 cdrom -> sr0
    is just the symlink. We need to see the output from
    Code:
    ls -al /dev/sr0
    to know the real device file permissions. Please use forum code-tags for all CLI output. That will retain the spacing and columns.

  6. #6
    Join Date
    May 2023
    Location
    South of Yosemite
    Beans
    22
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Hello TheFu, thanks for the reply.

    Code:
    brasscat@Ryzen56G:~$ ls -al /dev/sr0
    brw-rw----+ 1 root cdrom 11, 0 Jun 14 09:58 /dev/sr0
    You wrote "is just the symlink". I am unaware of the difference. OK, I see
    articles on this. Will study.

    Curious, as a member of cdrom, it appears I have read and write permissions ???

  7. #7
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Quote Originally Posted by BrassCat View Post
    Hello TheFu, thanks for the reply.

    Code:
    brasscat@Ryzen56G:~$ ls -al /dev/sr0
    brw-rw----+ 1 root cdrom 11, 0 Jun 14 09:58 /dev/sr0
    You wrote "is just the symlink". I am unaware of the difference. OK, I see
    articles on this. Will study.

    Curious, as a member of cdrom, it appears I have read and write permissions ???
    Well, there's a '+' character at the end of the shown permissions, which means that ACLs are being used and that the permissions displayed may be completely bogus. You'll need to use the getfacl command to see the real permissions. Hopefully, those won't override what is being displayed, but it is possible. ACLs are very powerful, but terrible for visibility of permissions. In 30+ yrs of doing Unix/Linux, I've needed to use ACLs just twice and they were very handy, but these days, I'll call ACL-abuse on lots of project teams because ACLs let them be lazy. For example, if you aren't in the cdrom group, you could add your personal group to the ACLs of the sr0 file with rw permissions, if you liked, but these permissions wouldn't be clearly shown until someone uses getfacl to see them.

  8. #8
    Join Date
    May 2023
    Location
    South of Yosemite
    Beans
    22
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Thanks ThuFu, I have run the suggested command. Now I need to read up on this.

    Code:
    getfacl /dev/sr0
    getfacl: Removing leading '/' from absolute path names
    # file: dev/sr0
    # owner: root
    # group: cdrom
    user::rw-
    user:brasscat:rw-
    group::rw-
    mask::rw-
    other::---
    I ran again without the / in front of dev/sr0.
    getfacl considered it an error.
    Last edited by BrassCat; 1 Week Ago at 01:01 AM. Reason: added

  9. #9
    Join Date
    May 2023
    Location
    South of Yosemite
    Beans
    22
    Distro
    Ubuntu 24.04 Noble Numbat

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    I am running the new release Ubuntu 24.04. Should be others having this problem.

  10. #10
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: Ubuntu 24.04 >>> I only have ReadOnly permission to blanck CD

    Quote Originally Posted by BrassCat View Post
    I am running the new release Ubuntu 24.04. Should be others having this problem.
    Very few people burn optical media anymore. I haven't since at least 2015. With Flash drives being huge and cheap, the lifespan of most home-burned optical media is about the same as a typical flash storage device. Get a pack of 128-256GB microSD cards or just a few $100 12TB HDD and the convenience over optical media is clear.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •