Hello, I have read through several threads on here and found out the processes needed to format the external for use with Time Machine. What I need help with is the ability to keep the data already stored on the external in tact while creating the partition for Time Machine. Right now the WD 1.5 TB HD is all NTFS and I read/write using the application 'NTFS for MacOSX". Currently the drive contains about 700gb of data that I want to keep in place and not corrupt, while creating another partition of about 150gb for a time machine back-up so I can format my Macbook then have all my applications and settings in place. I have already copied relevant data/ files that I need, I just want my setting preserved through the formatting. Is there a way I can partition the 150gb for the Time Machine, while still preserving the integrity of the rest of the drive? Hopefully you can be of some help. If this exact problem has been adressed before I apologize, I could not find it with a search. Thank you for your time!