I have a Seagate Free Agent Go Flex 1.5TB External Hard Drive. It comes with a driver installed to allow it to work with both Windows and Mac OSX. I have searched and read multiple threads here and elsewhere regarding this topic. I'd like to partition the drive so I can keep my media files (including videos over 4 GB, so not FAT32) on it and share it between a Windows laptop and my MacBook Air. The second partition would be for Time Machine backups. In the setup instructions for the drive online it says once I plug it in I have to decide how to set it up. "If you want to use the drive under Windows and MacOS, simply leave the drive in the NTFS format that it has when shipped from the factory (say No to "Do you want to use this drive with Time Machine?", if prompted). Install the included software which has a special driver that will allow the NTFS partition to be read and written under MacOS When using the NTFS driver, the Memeo software (included with the GoFlex products) and Time Machine will not work. However, you will be able to drag files to the drive, then transport them to a Windows computer." I'm new to OSX, so I'm not really familiar with Disk Utility. Is it possible to partition the drive and format only the added partition, leaving the other partition as is? Would doing this allow me to maintain the out of the box format and ability to read / write in both OSX and Windows? Then format the other partition to Mac OS Extended (Journaled) for Time Machine?