How to create a MBR partition in Lion without Boot Camp Assistant?

Does anybody know a way to create a MBR partition in Lion other than Boot Camp Assistant way? In terminal or some 3rd party software?
Thank you

To answer the question actually asked, the command line utility fdisk (run as "sudo fdisk -e /dev/disk0" for the appropriate disk0) can create and edit MBRs, even if the disk has a GPT partition table.
You need to verify that the MBR and the GPT partition tables agree with each other - at least as far as the start and end blocks of all the partitions they contain. OS X ignores the MBR. Disk utility will try and write a "correct" MBR, or just punt, and create an MBR with a single partition spanning the entire disk as a "protective"  partition.
Booting an OS using the MBR (i.e. - Windows) when it doesn't correctly describe the disk partitions it contains is a recipe for disaster.
rEFIt (a Mac boot manager) has a couple of useful tools here. Partition Inspector will display both GPT and MBR partition maps. On boot, there's a tool that will copy the first four partitions from the GPT to the MBR (basically, a smarter version of what Disk Utility tries to do).
There's also a third party utilllity called gdisk that is like fdisk, but for gpt partition tables.

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