Joerg Schilling wrote: > Dale <[EMAIL PROTECTED]> wrote: > > >>> I am sorry for my bad English. >>> I used to run all my cdrecord commands as user. I am unable to run the >>> command in the format using dev=scsibus,target,lun as user (I can do so >>> as root), but I am able to burn a cd as user when using dev=/dev/cdrom. >>> With the first method the average write speed seems to be much faster >>> than with the second one. >>> I just wander if this is normal behavior. I always followed >>> http://gentoo-wiki.com/HOWTO_Create_a_DVD:Burn where it says: >>> "[snip]Replace /<device>/ with your dvd device (for example >>> /dev/dvd)[snip]" So the wiki seems to be wrong, isn't it? >>> >>> >> Is the user you are attempting to run these commands as a member of the >> cd and cdrw groups? Usually if a command works as root but not a user, >> it is a permissions problem which is fixed by being in the correct >> group. I say usually. >> > > Not true in the case of cdrecord. > > The Linux kernel always needed root privs to burn media before 2004. > In 2004 a security bug was introduced that allowed to send any SCSI > command to any drive. > > In Autumn 2004 this bug was not fixed but the SCSI Linux kernel interface > was changed in an incompatible way. Now _some_ SCSI commands work as non-root. > > SCSI is a try and error protocol and cdrecord checks which commands are > working. > If it is possible to burn with the limuted non-root command set, it _may_ work > but there is a high risk for buffer underruns. In this case cdrecord believes > that you own a really dumb burner that does not support most of the nice > features.... > > Jörg > >
So that I have a better understanding of this, if he is not a member of the cd/cdrw group then the command would still work as a user? Dale :-) :-)
