Currently using a windows 10 laptop. I bought a new Seagate Backup Ultra Touch 2 TB Hard Drive. As I saw it comes with default exFAT format. I format to NTFS suddenly. Because all my HDD were in NTFS. I am also planning to buy a macbook pro this holiday season. I get to know that NTFS can only be read in mac not writable. So the only option is to make my hard disk exFAT again. My personal data is 250GB music, 100GB photos and 700GB of shows and movies. But the thing is what allocation size I should set? The default windows 10 is showing 512k. One guy told me you must keep 1024K in macs otherwise it will get corrupted in using both mac and windows. I don't remember what was the factory set allocation size when it came out of the box from seagate. Please help me out! Should I keep 128K or 512K?