Ultimate Boot CD

I'm trying to create a UBCD on a USB from my mac for a Windows 7 PC but the PC wont boot from the USB.
I have the bios set to boot from the usb, and I've been booting successfully to Ubuntu live and windows7 recovery via usb.

To make the USB I did the following:

I converted the iso to an img: I inserted my USB, got the disk number(5) and then unmounted it. I tried to overwrite the drive via:
I've had luck with this method making my ubuntu live usb and the windows7 recovery usb, but no dice with UBCD.

Whats up with this?

The "dd" method you describe can be used with isohybrid images. UBCD ISO images are not isohybrid.

Booting with SYSLINUX, the boot media for UBCD is expected to be formatted as FAT. The "dd" method generates a boot media that will use ISO9660, not FAT.

Since I always use SYSLINUX as bootloader for UBCD USB drives, I don't even know whether (all) the tools included in UBCD (specially those in fdubcd) would work correctly.

Ah! mkfs.vfat

a quick google gave me this post:

viewtopic.php?t=2405

and, mac still needs syslinux, details of that can be found here:

http://www.pyrosoft.co.uk/blog/2013/01/ ... -from-osx/