cdrecord not being cool

lackluster · 06-29-2003, 11:58 AM

after three days of getting burned (<--pun) with this dvd burner I've about given up. I can burn dvds fine, but now i need to make a cd and I can't get cdrecord to behave.

Code:

root@lackluster:/home/lackluster# cdrecord -scanbus
Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

my modules.conf looks like this:

Code:

###############################################################################
# cd/dvd burner
        options ide-cd ignore=hdc            # tell the ide-cd module to ignore hdb
        alias scd0 sr_mod                    # load sr_mod upon access of scd0
        pre-install sg     modprobe ide-scsi # load ide-scsi before sg
        pre-install sr_mod modprobe ide-scsi # load ide-scsi before sr_mod
        pre-install ide-scsi modprobe ide-cd # load ide-cd   before ide-scsi
###############################################################################

After searching google I found a post where somebody said "remove IDE CD-ROM support [from the kernel] to workaround it". DId that. No help. Someone else said "set the permissons on /dev/sg*". Nothing. Someone else said complie it from source. That's how I got this release in the first place.

I'm hoping maybe someone can solve this for all of the unanswered questions out there (I didn't see anyone who posted this problem actually get it to work).

stony · 06-29-2003, 12:07 PM

Quote:

Originally posted by lackluster
after three days of getting burned (<--pun) with this dvd burner I've about given up. I can burn dvds fine, but now i need to make a cd and I can't get cdrecord to behave.

Code:

root@lackluster:/home/lackluster# cdrecord -scanbus
Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.

Hi i would suggest you to read the error message exactly...

Quote:

cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
[/code]

my modules.conf looks like this:

Code:

###############################################################################
# cd/dvd burner
        options ide-cd ignore=hdc            # tell the ide-cd module to ignore hdb
        alias scd0 sr_mod                    # load sr_mod upon access of scd0
        pre-install sg     modprobe ide-scsi # load ide-scsi before sg
        pre-install sr_mod modprobe ide-scsi # load ide-scsi before sr_mod
        pre-install ide-scsi modprobe ide-cd # load ide-cd   before ide-scsi
###############################################################################

After searching google I found a post where somebody said "remove IDE CD-ROM support [from the kernel] to workaround it". DId that. No help. Someone else said "set the permissons on /dev/sg*". Nothing. Someone else said complie it from source. That's how I got this release in the first place.

I'm hoping maybe someone can solve this for all of the unanswered questions out there (I didn't see anyone who posted this problem actually get it to work). [/B]

cu

lackluster · 06-29-2003, 12:30 PM

? sorry, but can you break that down for me? I don't know what you're getting at

stony · 06-29-2003, 12:39 PM

Quote:

cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.

Hi,

just reading...

cu

lackluster · 06-29-2003, 01:05 PM

You're not very helpful. I said in my first post that I set the permissions on /dev/sg*. From the post you can see that I am root trying to execute this. Are you seeing some hidden code here that I'm not seeing?

Quote:

root@lackluster:/home/lackluster# cdrecord -scanbus
Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

whansard · 06-29-2003, 02:44 PM

you can see what modules are loaded by typeing
lsmod

modprobe sg inserts the scsi generic module.
there are several things that have to be compiled into
the kernel for the scsi emulation to work.

did you also use the hd?=ide-scsi in your boot loader too?

cropcircle · 06-29-2003, 05:41 PM

Lackluster: Try the following command : "cdrecord --scanbus".

You'll probably see something like :

<snip>
$ cdrecord --scanbus
Cdrecord 2.0 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jrg Schilling
Linux sg driver version: 3.1.24
Using libscg version 'schily-0.7'
cdrecord: Warning: using inofficial libscg transport code version (schily - Red Hat-scsi-linux-sg.c-1.75-RH '@(#)scsi-linux-sg.c 1.75 02/10/21 Copyright 1997 J. Schilling').
scsibus0:
0,0,0 0) 'COMBI ' 'RW16x10/DVD ' 'N1.1' Removable CD-ROM
0,1,0 1) *
<snip>

This example is on my PC.

If I want to record an ISO file I do :
"cdrecord --dev 0,0,0 <file.iso>"

If I want to do a fast erase of a CD-RW, I do :
"cdrecord --dev 0,0,0 blank=fast"

In you're case it will probably be about the same.

If you do : "dmesg |grep -i SCSI" you'll see something like this :

<snip>
kernel command line: ro root=LABEL=/ hdc=ide-scsi
ide_setup: hdc=ide-scsi
SCSI subsystem driver Revision: 1.00
hdc: attached ide-scsi driver.
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Type: CD-ROM ANSI SCSI revision: 02
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
sr0: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray
scsi1 : SCSI emulation for USB Mass Storage devices
Type: Direct-Access ANSI SCSI revision: 02
<snip>

Good luck.

ChrisW · 07-28-2003, 03:59 AM

lackluster, had the same problem. this fixed it for me:

- compile kernel with 'SCSI_GENERIC' support (module sg.o)
- add 'alias scsi_hostadapter ide-scsi' in /etc/modules.conf

i'm using suse 8.2.

mfg

chris