When booting from amd64 desktop 12.04 ISO (I did check the MD5), I get the
isolinux.bin missing or corrupt. error of doom.
Additionally, when (auto)mounting on Mac OS X Snow Leopard, I get an error that says
The disk you inserted was not readable by this computer. I get
Initialize..., which brings up Disk Utility to Format it, Ignore, and Eject.
I burned it on the Mac using the directions for a USB drive. I'm writing from a Late 2009 Macbook running 10.6.8 OS X, and booting on a TOSHIBA Portege Z835-P330. The card is a Kingston MicroSDHC 4GB, using a:
Kingston MicroSD(HC) => SD(HC) Adapter, and then a
Kodak SD(HC) => USB 2.0 Reader.