We currently have windows PCs networked in our home and sharing a Maxtor External Harddrive. This drive is connected via USB to my computer and shared over the network. It uses NTSF drive. I plan on replacing my compter with an iMac and the others will stay windows based. I want to keep sharing the External drive for backups, music, photos, etc. Will I need to make a change to the hard drive for that to work? Do I need to reformat the drive? If so, what is the process to do this, and still save the data currently on the drive?