I normally suggest at least one primary partition. There are some BIOS (Intel motherboards?) that will not even let you start to boot unless you have a primary partition with a boot flag. That is a Windows requirement, grub does not need it. You can have all logical if your BIOS is like most.
Separate Data partitions:
Partitioning basics with some info on /data, older but still good bodhi.zazen
http://ubuntuforums.org/showthread.p...data+partition
I prefer a separate /data partition. Then you can easily share your data without having the conflict of the user settings in hidden files & folders. Works best if all installed systems are Debian based, see UID issues below.
The actual user settings are small. My /home is 1GB with about 3/4 of that as .wine with Picasa which I have not yet moved to my /data. Because /home is small I now keep it as part of / (root).
Then I can have a fully functioning system on one drive but have data linked in from other partitions on other drives.
Data can be shared without the possible conflicts of user settings being different in different versions. I only copy some settings from one install to the next, normally. But I have to separately back up /home and the /data partition. Also saves the error of reformating a /home partition accidentally. I never reformat my /data and just configure / for install.
Splitting home directory discussion:
http://ubuntuforums.org/showthread.php?t=1811198
http://ubuntuforums.org/showthread.php?t=1901437
http://ubuntuforums.org/showthread.p...hlight=%2Fdata
Shared Data with Different operating systems, different uid and gid issues - Morbius1
http://ubuntuforums.org/showthread.php?t=1675381
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