Why would Linux be waking up every 5 to 10 seconds to write to the disk when I am sitting at my desktop or sitting at the login screen? (i.e. No programs running. Only 40 total wakeups seen in powertop)

- Seagate 320gig SATA
- XFS filesystem, relatime mount option enabled
- link_power_management_policy set to min_power
- vm.dirty_writeback_centisecs is set to 1500

I even unmounted /boot (default ext3) but that did not change anything. Every 5 to 10 seconds I see the HDD light flash and sometimes I hear a very faint "beeping" like the drive is waking up or powering off, whichever it is doing.

Thanks,
Michael

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