Format Seagate Drive to use across iMac and MacBook

I have purchased a Seagate Expansion Portable Drive to use together with Time Machine.
When I plug it in Time Machine asks if I want to use it as the storage device which I do so say yes.
I'm then asked if I want to format the drive. I am assuming that this is because it is formatted for windows as standard and Time Machine requires it to be formatted differently.
I am ok with this but in answer to a previous post it was recommened that I have different volumes for each Time Machine instance i.e. 1 for my iMac and 1 for my MacBook.
Question. Should I manually format the drive for 2 volumes? If so how do I do this?
OR
Will the format process let me set up seperate volumes and is this straightforward?
Thanks
Paul..

Thanks Niel. I have found out how to do this but am not sure of the option to choose under Format:
There are 4 which start Mac OSX Extended. I'm assuming that it is one of them.
Also assuming that once I've done this Time Machine will see them as drives to access.
Paul..

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http://www.lacie.com/no/products/product.htm?pid=11038
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http://pc.wikia.com/wiki/FAT32
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