Hello all,

Please can someone assist?

I am attempting to install an external dvdrw on fedora 6.

I attach the dvdrw device to the USB port and run dmesg:

scsi2 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 4
usb-storage: waiting for device to settle before scanning
scsi 2:0:0:0: CD-ROM SONY DVD RW DRU-710A BY01 PQ: 0 ANSI: 0
scsi 2:0:0:0: Attached scsi generic sg0 type 5
usb-storage: device scan complete
sr0: scsi3-mmc drive: 62x/62x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 2:0:0:0: Attached scsi CD-ROM sr0

I presume the system has picked up the device and check /dev:

# ls -lrt /dev

brw-rw---- 1 root disk 11, 0 Mar 28 14:35 scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvdwriter-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvdwriter -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvd-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvdrw-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvdrw -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 dvd -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdwriter-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdwriter -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdrw-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdrw -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdrom-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 28 14:35 cdrom -> scd0

I try to mount the device however get the following error:

# mount /dev/scd0 -t iso9660 -r /mnt/usbcdrom

mount: wrong fs type, bad option, bad superblock on /dev/scd0,
missing codepage or other error
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)
In some cases useful info is found in syslog - try
dmesg | tail or so

can anyone tell me where I am going wrong? I have read several documents but cant seem to find any useful info.

many thanks

chris

Dmesg reports the device as generic SCSI, sg0. Look in /dev for sg* devices, and try to mount those. Also, you may not need the "-t iso9660" in there, since most of the times I've used CD/DVD's, the filesystype was auto-identified.

I have an external CD burner, and it shows up as /dev/sr0 when I plug it in. Are those /dev/scd* devices there before you plug in the burner?

the devices /dev/scd* disapear when i detach the cdburner

Are there any /dev/sg* devices there??? Did you try the mount without specifying the FS type?

One other thing I thought of is to do an 'lsmod', and look for the usb-storage module. When I do 'lsmod | grep usb', I get:

----------------------
usb_storage 105280 0
hci_usb 35740 0
bluetooth 90116 4 rfcomm,hidp,l2cap,hci_usb
usbhid 69792 0
usbcore 148064 5 usb_storage,hci_usb,usbhid,ohci_hcd,ehci_hcd
scsi_mod 173744 8 usb_storage,st,sr_mod,aic7xxx,scsi_transport_spi,sg,libata,sd_mod
ide_core 174720 4 usb_storage,ide_cd,amd74xx,ide_disk
------------------------

And things appear to be working. My external CD-Burner shows up and is mountable. If usb-storage isn't there, do a 'modprobe usb-storage'. I'm on SuSE now, but it should be the same for you.

Also, I know you've probably checked this already, but is the CD/DVD you're trying to mount actually readable by another system?

output from # ls -l /dev
crw------- 1 root root 21, 0 Mar 30 12:03 sg0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvdwriter-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvdwriter -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvd-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvdrw-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvdrw -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 dvd -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdwriter-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdwriter -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdrw-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdrw -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdrom-sr0 -> scd0
lrwxrwxrwx 1 root root 4 Mar 30 12:03 cdrom -> scd0

what should the entry in the fstab look like if any?

also it is worth noting that a dvd or cd with data on can be mounted however blank cd's cannot.

Thanks

No fstab entry is required.

However, you can't mount a blank CD/DVD at all....it's got no filesystem TO mount. You've got to burn something to it, and put a filesystem on it, before you can use it, just like you have to format a blank hard drive.

When I run modprobe usb-storage. This is what I get:
FATAL: could not load modules /lib/modules/2.6.16.21-0.8-default/modules.dep

Can you assist ? I will post as a new request if I dont here back as I'm unsure if this will work as a reply to this thread.