Jan-Hinrich Fessel writes:
> 
> > > cd1 at scsibus1 targ 5 lun 0: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > > cd2 at scsibus1 targ 5 lun 1: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > > cd3 at scsibus1 targ 5 lun 2: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > > cd4 at scsibus1 targ 5 lun 3: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > > cd5 at scsibus1 targ 5 lun 4: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > > cd6 at scsibus1 targ 5 lun 5: <PIONEER, CD-ROM DRM-624X, 1.03> SCSI2 5/cdrom removable
> > 
> > How do you get it to recognize them all?  Mine just reports one drive.
> 
> Maybe adding the following to scsi_quirk_patterns[] in /sys/scsi/scsiconf.c 
> will help.
> If it does, be prepared to send-pr it:
> ====
>         {{T_CDROM, T_REMOV,
>          "PIONEER ", "CD-ROM DRM-602X ", ""}, SDEV_FORCELUNS},
> ====

Hm.  No apparent effect.  And here's a new twist.  When doing a "dd
if=/dev/cd0a of=cd0a-groliers count=500" it gets these errors and bus
corruptions as well.  It works fine on the two CDs that mount cleanly.  I
am beginning to suspect that the problem is that I have a bad drive!  I
will swap it out with another tonight and see what happens.

What else could cause this type of complete failure on just a simple
block-by-block read of a CD?

Mark