[ubuntu] Can not save to external hard drive

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http://ubuntuforums.org – I have a WD My password essential external hard drive. In Windows xp, vistan and 7 I can use it fine, however, my Ubuntu (9.10) can not save to it. I keep getting the message "error while copying to WD Smartware, destination is read only". I have tried formating to NTFS, Fat 32, using G-parted (which sees all partitions on my machine expect this external hard drive). How can I get this silly thing to work. I have used other external hard drives with out a problem and my memory stick (flash disks) work fine. Ps: it comes with pre-loaded software to back up system (that on (Hardware)