Question on CDROM access

[sahlot arvind]

Hi,

I am running Ubuntu 11.10 and my CDROM drive's LED keeps blinking. I want
to know which process is accessing CDROM for no reasons. There is no media
in the drive, I believe OS seems to access it for media change events, but
I am more interested in which process or deamon is actually doing it.

I tried the followings and nothing gave anything:

'lsof | grep -in 'cdrom'
'lsof | grep -in 'sr0'
'lsof | grep -in 'sg0'

What tools could I use to track down the process, which is accessing my CD
drive?

Thanks in advance.
Asahlot
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