On 11 Mar 2006, Joachim B Haga wrote:

> I have an external usb DVD writer, branded "Samsung Writemaster"
> (TSSTcorp CD/DVDW SH-W162C). When it is connected, it is recognised by
> usb-storage, but it is not added as a device (device nodes are not
> created etc).
> 
> I have an external usb hard drive enclosure and an ogg/mp3 player
> which both work fine. Comparing the logs when attaching the hard drive
> to attaching the the dvd writer, the differences are:
> 
> [udevmonitor, missing lines for the dvd writer marked with "-"]
> 
>  UEVENT[] add@/devices/pci0000:00/0000:00:10.3/usb4/4-1
>  UEVENT[] add@/devices/pci0000:00/0000:00:10.3/usb4/4-1/4-1:1.0
>  UEVENT[] add@/class/scsi_host/host3
>  UEVENT[] add@/class/usb_device/usbdev4.5
>  UDEV  [] add@/devices/pci0000:00/0000:00:10.3/usb4/4-1
>  UDEV  [] add@/devices/pci0000:00/0000:00:10.3/usb4/4-1/4-1:1.0
>  UDEV  [] add@/class/scsi_host/host3
>  UDEV  [] add@/class/usb_device/usbdev4.5
>  UEVENT[] 
> add@/devices/pci0000:00/0000:00:10.3/usb4/4-1/4-1:1.0/host3/target3:0:0/3:0:0:0
> -UEVENT[] add@/block/sda
> -UEVENT[] add@/block/sda/sda1
>  UEVENT[] add@/class/scsi_device/3:0:0:0
>  UDEV  [] 
> add@/devices/pci0000:00/0000:00:10.3/usb4/4-1/4-1:1.0/host3/target3:0:0/3:0:0:0
>  UDEV  [] add@/class/scsi_device/3:0:0:0
> -UDEV  [] add@/block/sda
> -UDEV  [] add@/block/sda/sda1

Looks like nothing is wrong at all.  Your mistake is thinking that a DVD 
device would should up as a disk.  It doesn't; it shows up as a CD-type 
device.  You need to have the sr-mod module loaded.  Then the drive will 
show up as /dev/sr0 (or /dev/scd0 on RedHat-based systems).

Alan Stern



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