I've actually managed to solve this one by doing something completely
different.

I've got a black WD Passport drive formatted as ntfs which uses a small
10cm USB cable. Whenever I'd boot up with the drive plugged in with this
cable, it would be detected on boot only half the time. If I used a
longer cable, it wouldn't ever be automounted on boot, but would show up
in /dev, and I would have to manually mount.

I then bought a Lindy dual-power USB cable (http://www.lindy.co.uk/usb-
cable-dual-power-2-x-type-a-to-mini-b-usb-2-1m/31780.html) and that's
fixed the problem completely. It ALWAYS automounts when I boot-up. Since
the WD Passport drives use the USB connection to power the drive, and it
is known that if your USB ports don't provide enough power, the drive
won't work properly. In my case, if I plugged the drive into my other
add-on PCI USB card, the drive wouldn't even spin-up.

This is on Gutsy with the vanilla install kernel. The question would be,
could this phenomena be related to this bug? How many of the other
reporter's drives are powered through the usb cable? Could Linux be
finicky regarding automounting when the drive isn't fully powered, i.e.
spinning at full-speed?

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USB drive not detected if booted with drive connected
https://bugs.launchpad.net/bugs/49890
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