Comment 38 for bug 548513

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Jerone Young (jerone) wrote : Re: Some firewire & usb disks not working under 10.04

@Colin
      This would only solve the problem for firewire drives(?) or at lest just Western digital. Also as mentioned APM is not the only issue .. just one of many. I would suggest not running hdparm at all for firewire drives & usb drives .. as my patch to udev does this ensures full compatibility.

      Since the kernel is setting everything up correctly .. then hdparm comes in and messes these drives up. Until the root cause for all the issues can be solved it's best to not run hdparm on removable drives.

       Peter is doing a great job getting closer to the root causes.