The first one involves repairing the installation volume’s permissions using Disk Utility. According to CNET, there may be a few ways to reinstall OS X on your new Mac computer.
This means that your Mac will continue to run on Mac OS X (Journaled) and Windows will be able to run on NTFS. Partitioning splits your hard drive into 2 separate sections, each with its own format. Macs run on Mac OS X (Journaled) and Windows runs on NTFS.
Well the reason is that Windows and Mac don’t run on the same format.
