All,

I was getting exactly this same error following a fresh 8.1 load

Sep 25 07:51:22 cyborg kernel: acd0: FAILURE - READ_BIG ILLEGAL REQUEST 
asc=0x64 ascq=0x00
Sep 25 07:51:22 cyborg kernel: (cd0:ata1:0:0:0): READ(10). CDB: 28 0 0 0 0 0 0 
0 40 0
Sep 25 07:51:22 cyborg kernel: (cd0:ata1:0:0:0): CAM status: SCSI Status Error
Sep 25 07:51:22 cyborg kernel: (cd0:ata1:0:0:0): SCSI status: Check Condition
Sep 25 07:51:22 cyborg kernel: (cd0:ata1:0:0:0): SCSI sense: ILLEGAL REQUEST 
asc:64,0 (Illegal mode for this track)
Sep 25 07:51:22 cyborg kernel: (cd0:ata1:0:0:0): cddone: got error 0x6 back

the solution was explained in the gnome install FAQ - here is a clip - the devfs.conf changes fixed the problem.

To figure out which CD/DVD drive you will be using, run the following command as root:

# camcontrol devlist


Your output will look similar to the following:

<QSI CDRW/DVD SBW-242 UD22>       at scbus1 target 0 lun 0 (cd0,pass0)


The devices in parentheses at the end are important. You must make sure the /dev entries for those devices are writable by the users that will be using brasero, totem, rhythmbox, or sound-juicer. In addition to those devices, /dev/xpt* must also be writable to your brasero, totem, rhythmbox, and sound-juicer users. The following /etc/devfs.conf configuration will achieve the desired results given the above devlist:

perm    cd0     0666
perm    xpt0    0666
perm    pass0   0666

Nick


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