Hard disk won't spin down; what's accessing it?

[Brian Kendig <brian@enchanter.net>]

I have my laptop's hard drive spindown timeout (hdparm -S) set to two 
minutes, but the hard drive never spins down.  I figure this is because 
there's some process hitting it more often than every two minutes.

But I can't figure out what process is responsible for this.  It's not 
the system logs; those aren't being written to that often.

How do I find out what process is making disk accesses and keeping it 
from spinning down?


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