[ubuntu] Reformatting External HDD Ubuntu/Vista

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http://ubuntuforums.org – Hi, Some while ago my brother installed Ubuntu on an external hard drive and password protected it. Unfortunately he can't remember the password and wants me to reformat it but I don't know how. Google shows many results but the solutions all seem to require being already logged into Ubuntu to do the reformatting. I have access to a laptop with Windows Vista installed onto it and was wondering if there was some way to use Vista to do it. I want the new format to still be Linux as well and use a NTFS file system. Thanks in advance! (Hardware)