[Thinkpad] Booting a Thinkpad x30 from an external cd

I've burned some live Linux CD's with an external USB cd writer from an
X30. Burned with
cdrecord -pad -dao -v -eject -data ~/path/to/foo.iso

I've not been able to actually boot from anything today. Even tried
speed=2. During the burn process got messages of buffer underruns :/
Anyone came across this before? If so what have you done to over come
this?

Getting messages of unable to mount /[can't remember] every time that I
try to boot.

-- 
John Maclean
MSc (DIC)
07739 171 531
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