Harddisk fails to enter sleep when not used!

Hello,
I want the harddisk to be switched off when the Macbook is apparently doing nothing, but switched on. Therefore I activated the according option in the powermanagement. But it doesn't work, even after rebooting.
How can I find out which process accesses the disk and so prevents the disk to sleep?
Does anybodey have the same problem?
I eaven tried with manually setting the sleeptimer to 1 minute
within the console and the command pmset.
Thanks
MBP Mac OS X (10.4.6)

Yes I checked the box.
The activity monitor doesn't help me any further because it only display the current processes and not only the process which regulary accesses the disk. Perhaps this isn't the cause anyway.
But thanks for your idea.

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Harddisk fails to enter sleep when not used!

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