How to configure hdb disk?

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http://www.linuxquestions.org – Hello I have installed Mandriva2007.My second hard disk,named as hdb,was not detected at installation time,after detecting that with harddrake,still it is not mountable,because,in configuring that,a message said to me that its' file system (already ntfs) must be changed,so i cancelled the configuration because,i need to use that when i am working with my first operating system (windows7)too (because more than 90% ofit consists of music and movie files) Windows related partitions(ntfs) on hda(Mandriva is here too) are already mounted. My question is: -why file system on hdb must be changed?Because if ntfs is not use able by Linux,then how are they used in other(hda) disk? -How do i solve this problem? Thanks (HowTos)