[nflug] CD/DVD drives not working in linux

David J. Andruczyk djandruczyk at yahoo.com
Mon Mar 13 17:03:59 EST 2006



--- "Robert F. Stockdale IV" <javabob at adelphia.net> wrote:

> Thanks Dave:
> 	Unfortunately it didn't work. Actually I had it that way before. I
> emerged lsscsi and it shows:
> java bob # lsscsi
> [0:0:1:0]    cd/dvd  PIONEER  DVD-ROM DVD-303  1.09  /dev/sr0
> [0:0:4:0]    cd/dvd  YAMAHA   CRW-F1S          1.0c  /dev/sr1
> [1:0:0:0]    cd/dvd  DVDRW    DRW-3S163        BSG2  /dev/sr2
> [2:0:0:0]    disk    SEAGATE  ST336607LW       0006  /dev/sda
> [2:0:1:0]    disk    SEAGATE  ST336607LW       0006  /dev/sdb
> [2:0:2:0]    disk    SEAGATE  ST336607LW       0006  /dev/sdc
> 
> The lsmod command you gave me shows:
> java bob # lsmod |grep sr_mod
> sr_mod                 15268  3
> cdrom                  38560  1 sr_mod
> 
> 
> Finally, I ran dmesg and it revealed /dev/sr1 having an ioctl error.
> In fact the tail on it 
> looks like:
> 
> sr1: CDROM (ioctl) error, command: <6>cdb[0]=0x0 00 00 00 00 00 00
> sr: Current: sense key=0x3
>      ASC=0x57 ASCQ=0x0
> sr1: CDROM (ioctl) error, command: <6>cdb[0]=0x0 00 00 00 00 00 00
> sr: Current: sense key=0x3
>      ASC=0x57 ASCQ=0x0
> sr0: CDROM not ready.  Make sure there is a disc in the drive.
> cdrom: open failed.
> cdrom: open failed.
> scsi1 (0:0): rejecting I/O to offline device
> 
> 
> So it looks like bus A on my Adaptec 2940UW is giving me problems.
> Do you have any other ideas?

Sounds like either A. a failed device or SCSI bridge, or B, termination
issues. (B is more likely).

Which ACARD bridge are you using the 7722, or the 7726?   The 7722 are
ONLY for ATAPI (CD/DVD) devices, the 7726 is ONLY for IDE disks.

  How is the SCSI bus configured termination wise?  The bus should be
terminated ONLY and I mean ONLY at it's ends.  If you have termination
enabled at multiple points (aside from the ends) the SCSI bus will have
erratic problems or not work at all. (some devices may go offline, or
throw errors, whereas others can and may work fine.)

Typically the adaptec card will auto-terminate at it's end,  there
should be a terminator at the end of the bus.



Dave J. Andruczyk

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
nflug mailing list
nflug at nflug.org
http://www.nflug.org/mailman/listinfo/nflug



More information about the nflug mailing list