I've had this happen over time when a drive is nearing EOL, as generally the drive would get flaky and not show up occasionally. Replacing it with a new one worked... This has happened several times with internal or usb units. Run "tail -f /var/log/syslog" to see if udev finds it when inserted and creates the /dev/sr0 interface for it. Flaky ones would usually probe, but not respond correctly giving errors in syslog, and thus not fully building the /dev/sr0 interface being amiss. -mb On 12/08/2012 12:26 PM, joe@actionline.com wrote: > > Thanks to all. It is working now. > Actually, I did not change anything, > but when I tried it again today, > it worked fine. > > --------- >> You did not say what distro or release you are running so some answers >> people supply may not be right for your system. That said, see below: >> >> On Fri, Dec 7, 2012 at 12:49 PM, wrote: >> >>> I have an external dvd burner connected to my computer, >>> but when I try to run K3b, the following message appears: >>> >>>> No optical drive found. >>>> K3b did not find any optical device in your system. >>>> Solution: Make sure HAL daemon is running, it is used >>>> by K3b for finding devices. >>> >>> How can I determine if the HAL daemon is running? >>> Or if it is not, what do I need to do to make sure that >>> it always does run? >>> >> >> On my Ubuntu 12.04 and 12.10 systems, I do not see a hal daemon running, >> but plugging in an external USB CD/DVD drive is visible and usable (I am >> not set to use k3b). That makes me wonder if hal has been replaced. >> >> Are you plugging in the external burner BEFORE starting k3b? Sometimes a >> program queries for available devices only on program start. If you start >> k3b first, exit and only start it AFTER plugging in the device. Also, try >> having some media in the drive before starting k3b. >> >> Is it only k3b that does not see the external drive. If the who system >> does not see it, the problem is more likely the external drive or not >> having a valid driver for it. You might try an lsusb to see if it is even >> visible to Linux. I get "Bus 002 Device 004: ID 0411:01dc BUFFALO INC. >> (formerly MelCo., Inc.)". >> >> You could also do an lshw -short before plugging it in and another after >> to >> see if another line was listed such as "/2 scsi7 storage". >> >> If you don't, try some other external USB device as a test. >> >>> >>> >>> >>> >>> --------------------------------------------------- >>> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >>> To subscribe, unsubscribe, or to change your mail settings: >>> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >>> >> >> >> > > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss > > --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org To subscribe, unsubscribe, or to change your mail settings: http://lists.phxlinux.org/mailman/listinfo/plug-discuss