Hello everybody I hope this is the right place to post my question! I'm new to Macs. I have a 2 TB external HDD. A PC and a MacBook Air with 128GB SSD. I want to create a NTFS partition for PC, a HFS+ partition for Mac and a partition to use Time Machine with my MacBook Air (HFS+ again I guess?) I know how to format the HDD on my PC but not on Mac. How do I format the external hdd with the 3 partitions and with the different file systems? Also, I've read I should use more space with Time Machine partition then there is on the Macbook Air. My Air has 128GB how much space should I use with Time Machine, 256GB?