Can't find USB SCSI emulation device
 

Okay, this is my first forum post...I've always been able to Google everything up to this point (I've been using linux for about 5 months).

My problem is with an NEC DVD-Burner that I just bought. I have everything I need to use SCSI emulation, as I have been using an external hardrive enclosure via USB. It works fine. I just mount /dev/sda1 and presto...

So, I got this burner, plugged it up, and the first time I do it everything's great...it's on sda, the harddrive is on sdb1. But, I realize I don't have a blank DVD, therefore I can't make sure it mounts (it says wrong FS--duh). Alright, so got around to getting DVDs today and plugged it in again.

This time the hard drive is on sda1, so I assume the burner is on sdb, but it's not there. ( I get 'special device sdb does not exist'. I checked /dev...there's nothing there but sda).

I'm missing the line that usually goes sda:sda1 at the end of dmesg:

usb 1-1: new full speed USB device using uhci_hcd and address 5
scsi5 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 5
usb-storage: waiting for device to settle before scanning
usb 1-2: new full speed USB device using uhci_hcd and address 6
scsi6 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
Vendor: Maxtor 6 Model: Y080L0 Rev: YAR4
Type: Direct-Access ANSI SCSI revision: 00
SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
sda: assuming drive cache: write through
SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
sda: assuming drive cache: write through
sda: sda1
Attached scsi disk sda at scsi5, channel 0, id 0, lun 0
usb-storage: device scan complete
Vendor: _NEC Model: DVD_RW ND-3540A Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 00
usb-storage: device scan complete
---------------------------
cat /proc/scsi/scsi gives me this:
Attached devices:
Host: scsi5 Channel: 00 Id: 00 Lun: 00
Vendor: Maxtor 6 Model: Y080L0 Rev: YAR4
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: _NEC Model: DVD_RW ND-3540A Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02

I thought maybe the problem was plugging it into a usb 1.1 port, because the first time I plugged it into my usb 2.0 pcmcia card. So, I tried that and it didn't work. It also doesn't help if the hard drive is not plugged in.

Oh, and I'm using Debian Unstable with kernel 2.6.13.

Thank you!

Sydney

Actually your burner should be /dev/scd0. Scsi CD devices use a different type of sturcture than IDE device blocks.

Hope this helps.
Brian1

Unfortunately, /dev/scd0 does not exist either. I really have no idea what else to try. There are no other devices under /dev/.

Look at the output of the lsmod command. Do you see a module sr_mod?
If not then try:
modprobe sr_mod

Then look for a /dev/scd0 or /dev/sr0 device.