"Me too" (DVD is a SATA Pioneer DVR-218L, also Ubuntu 9.10 "server"
x86_64).  I'll add that I'm a Unix veteran, but a udev newbie, so I'm
not sure which I'm seeing here is cause or effect.

Running "udevadm monitor" as root shows a "continual burst" of change
events of the form:

KERNEL[1262122476.998785] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0 (scsi)
KERNEL[1262122476.999378] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0/block/sr0
 (block)
UDEV  [1262122476.999401] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0 (scsi)
UDEV  [1262122478.268607] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0/block/sr0
 (block)
KERNEL[1262122478.280167] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0 (scsi)
KERNEL[1262122478.280328] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0/block/sr0
 (block)
UDEV  [1262122478.280350] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0 (scsi)
UDEV  [1262122478.502319] change   
/devices/pci0000:00/0000:00:1c.3/0000:03:00.0/host6/target6:0:0/6:0:0:0/block/sr0
 (block)

This then appears to quiesce until the drive spins down, at which point
another burst of events will occur.

(The following is conjecture from newbieness).

Editing /lib/udev/rules.d/60-cdrom_id.rules and modifying the action
from "add|change" to "add" (plus appropriate restart) stops the spinup,
but also nobbles the creation of /dev/cdrom and friends (of course, as
that's its purpose in life).  I guess the issue here is should we be
seeing continual change events from/for the DVD, or should cdrom_id be
running on every change event?

This issue doesn't seem to have garnered much interest.  :-(

-- 
CD-ROM not spinning down
https://bugs.launchpad.net/bugs/496836
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