In the System Event Viewer I see an event that occurs every 15 minutes on
one of my disk drives. I have no idea what is doing this as the drive passes
all diagnostics that I've done. I've swapped cables and controllers with no
change.

This is a Western Digital 36gig 10,000rpm SATA hard drive. It's connected to
the SATA controller on a DFI nF4 LanParty Ultra-d mainboard.

The trap is as follows:

Event Type: Warning
Event Source: Disk
Event Category: None
Event ID: 51
Date: 2007-06-12
Time: 8:44:18 AM
User: N/A
Computer: STEVESPC
Description:
An error was detected on device \Device\Harddisk2\D during a paging
operation.

.... and these traps occur at 15 minute intervals:

7:42:55am
7:58:20am
8:13:39am
8:28:57am
8:44:18am

.... WHAT could Windows be doing that would cause this behaviour? What
happens every 15 minutes that would flag an error on this drive?

Currently the drive holds my "My Documents" folder, but I was getting these
same events with a freshly formatted drive - before any files were put onto
it.