Re: No cdrom device

[Wayne Topa <linuxtwo@gmail.com>]

On 12/23/2011 12:18 PM, Ed Jabbour wrote:
> CDROM tray will not respond to "eject":
> ========================
> [Fri Dec 23] edj:~$ eject
> eject: tried to use `/media/cdrom0' as device name but it is no block device
> eject: tried to use `/dev/scd0' as device name but it is no block device
> eject: unable to find or open device for: `cdrom'
> =========================
>
> Perhaps related, dmesg reveals:
> ==============================
> 6.720030] ata1: link is slow to respond, please be patient (ready=0)
> [   11.704028] ata1: device not ready (errno=-16), forcing hardreset
> [   16.900028] ata1: link is slow to respond, please be patient (ready=0)
> [   21.716029] ata1: SRST failed (errno=-16)
> [   26.912027] ata1: link is slow to respond, please be patient (ready=0)
> [   31.728027] ata1: SRST failed (errno=-16)
> [   36.924030] ata1: link is slow to respond, please be patient (ready=0)
> [   66.772029] ata1: SRST failed (errno=-16)
> [   71.800028] ata1: SRST failed (errno=-16)
> [   71.811047] ata1: reset failed, giving up
> [   71.811185] ata2: port disabled--ignoring
> =============================
>
> modprobe cdrom sr_mod:
> ==============================
> FATAL: Error inserting cdrom (/lib/modules/3.1.0-1-686-
> pae/kernel/drivers/cdrom/cdrom.ko): Unknown symbol in module, or unknown
> parameter (see dmesg)
>
> 728.919036] cdrom: Unknown parameter `sr_mod'
> ===================================
>
> Nor will the tray open manually, except that it does if on reboot, I push the
> button before GRUB takes over.   Running testing with the 3.1.0-1-686-pae
> kernel, although the problem persists no matter which kernel I boot into.
>
> Any advice, pointers, etc. appreciated.

Locate your cdrom with:

$dmesg |grep -A2 B2 cdrom

Which in my case returns;

~$ dmesg |grep -A2 -B2 cdrom
[    2.592157] sd 2:0:0:0: [sda] Attached SCSI disk
[    2.640560] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw 
xa/form2 cdda tray
[    2.640634] cdrom: Uniform CD-ROM driver Revision: 3.20
[    2.640848] sr 0:0:0:0: Attached scsi CD-ROM sr0
[    2.704036] usb 4-1: new full speed USB device number 2 using ohci_hcd

Which shows my cdrom is /dev/sd0

I eject with:
eject /dev/sr0

or with this line in my /etc/fstab
/dev/sr0       /media/cdrom0   udf,iso9660 user,noauto     0       0

eject /media/cdrom0

HTH

WT



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