[Slackware 13.1]a question about primary partition for Slackware

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http://linuxfloat.org – Hey, guys, I have one primary partition (Windows 7 is on it), one logical partition (my data is on it) and 15GB of unpartitioned space, where I want to install Slackware 13.1. The question is, can I make yet another primary partition (where my Slackware would be) or I am not allowed to do that because of existing primaty partition (Windows 7 system)? (HowTos)