How do I change permissions on 3rd HD...so I can backup OpenSuse 11.4

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http://www.linuxquestions.org – My 3 HD's 1) XP (Master) 2) OpenSuse 11.4 (Slave) 3) 250GB drv on a PCI adapter card that increases my IDE from 4 to 8 4) DVD writer (Master) 5) CD-DVD reader only (Slave) The drive I want to read & write to is /windows/D (#3)...right now I can view the contents but not write to...after I clean-scan for virus' as a regular user...I can write-save to DVD's but not the 3rd drive (ie...Access Denied). I have little knowledge of the CLI so I try and grant permission via the root GUI..I login as root, bring up the drive (250GB), change permission to my user name and group...click apply whic (HowTos)