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Not...
Like I mentioned in this article, you cannot have that. Or I least I did not manage to find a solution...
What I think you should do is... change the drive letter of your data partition to E: in both Windows Vista and Windows XP.
In Vista you will have:
C: Vista
D: XP
E: your data partition
In XP you will have:
C: XP
D: Vista
E: your data partition.