Seperate data partition, access from both XP and Vista

Hi,

I am using Beta2 of Vista via MSDN.

I currently have 3 partitions on my hard drive, 1 for XP Pro, 1 for Vista
and 1 for data. The data drive (E I want to be able to access and use from
both XP and Vista.

In XP all I do is point 'my documents' at the root of my data drive and all
is good, however in Vista I cannot seem to do this and I can get read access
to my data drive which is not very useful. I could do a blanket permission
change on my data drive but I would like to understand if there is a better
way.

Thanks in advance.

Vortal