The issue here is the "hdparm" command is launched by udev. It then attempts to 
try to activate ata pass through. This then causes the drive to fail.
bug 515023 

But disabling hdparm from being lauched by udev gets around the issue.
Then the drive works fine.

I tested the latest hdparm (9.28) and still see it trying to do ata pass
through.

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Some firewire disks not working under 10.04
https://bugs.launchpad.net/bugs/548513
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