System log is filling up with "VFS: Disk change detected on device

[Miles Lane]

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My /var/log/messages is getting consistently flooded with these
messages:

   VFS: Disk change detected on device sr(11,1)
   VFS: Disk change detected on device sr(11,1)
   VFS: Disk change detected on device sr(11,0)
   VFS: Disk change detected on device sr(11,0)

Any idea why this is happening and what I can do to make it
shut up?  There is no CD in either drive.

SCSI storage controller: Adaptec AHA-2930CU (rev 03)

scsibus0:
   0,0,0   0) PIONEER  DVD-ROM DVD-114 1.17  Removable CD-ROM
   0,1,0   1) IDE-CD   R/RW 4x4x24     1.08  Removable CD-ROM

Module                  Size  Used by
sg                     25860   0  (autoclean)
sr_mod                 14232   0  (autoclean)
cdrom                  28032   0  (autoclean) [sr_mod]
ide-scsi                8512   0=20
scsi_mod               94596   3  [sg sr_mod ide-scsi]

Thanks,
	Miles

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