I've read this a couple of times but still do not see the advantage of what you accomplished on such a small drive.
Successful setup of OS X Lion + Bootcamp Windows 7 Ult + Data Partition
After many, many hours I think I've finally figured out how to successfully install Mac OS X Lion with Windows 7 on a Bootcamp partition AND an 3rd data partition.
Here is a screenshot of my setup on my 13" MacBook Pro: <Disk Utility screenshot><https://lh4.googleusercontent.com/-bk-rxKMuO5s/Tloi1AyFemI/AAAAAAAAFAA/IJdrs7HAv3s/s800/disk_util_screenshot.png>
As you can see, I have my internal 500GB hard drive partitioned the following way:
120GB - OS X Lion (system and apps)
316GB - workspace partition (user files, projects)
64GB - Bootcamp Windows 7 Ultimate
To make this work, I started with the standard procedure of installing OS X Lion on a single Mac OS Ext partition and using Bootcamp Assistant to build the Bootcamp partition for Windows.
Then I did 2 key things:
1. Before installing Windows on the Bootcamp partition, I first went back to Disk Utility, shrunk the OS X Lion partition, and inserted a 3rd partition Workspace_HD for all my user files. Then I restarted and installed Windows 7.
2. After Win 7 Ultimate, the Bootcamp drivers and Office 2010 were installed and activated, I DID NOT make any changes to any partitions. I can put whatever I want on any partition, but I CAN NOT shrink, resize, delete, create, or modify any partition. Any change to the partition tables after Windows is installed will BREAK the Bootcamp partition.
I went thru 3 broken installs of Bootcamp/Win7 to figure this out.
Again, the key to this working is creating your extra partitions AFTER you make the Bootcamp partition but BEFORE you install Windows.
I will rebuild my system for a 5th time to fully document the process with screenshots, but this time with 5 partitions: OS X Lion startup, Workspace, custom 20GB OS X Lion recovery partition, 30GB FAT32 shared Mac/Win data partition, and a Bootcamp partition with Windows 7 Ultimate.
Until then, I hope this works for you!! Good Luck!! ![]()

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic