This is a problem for iso-scan/filename=, too.  It gets the list of
block devs on the system at the start, and goes through that list, then
drops you to a shell.  On a fast machine, the boot scripts get to
/scripts/casper/20iso-scan before USB devices have shown up.  Even the
internal hard drive maybe hadn't read its partition table yet.  (dual
quad-core Harpertown server. :)

 I worked around it by adding  break=mount  to the kernel command line.
Then I wait for my USB stick to be detected before pressing ^D at the
(initramfs) shell prompt to continue the boot.  break=premount is no
good, because USB keyboard drivers haven't been loaded yet, AFAICT!

I tried this with Intrepid alpha 4, AMD64 and i386.

-- 
Casper doesn't wait for USB hard disks to come up
https://bugs.launchpad.net/bugs/158976
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