Playback and Recording : Record Setup : Working with Hard Drives for Recording : Disk Allocation and Cross-Platform Sessions

Disk Allocation and Cross-Platform Sessions
To ensure cross-platform operation, it is required that Mac Pro Tools sessions and their associated audio files be on Mac-formatted (HFS or HFS+) drives. Windows Pro Tools sessions and their associated audio files must be on Windows-formatted NTFS drives.
 
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On Windows, with the HFS+ Disk Support option installed, you can record to and play back from Mac-formatted HFS+ drives. For more information, see the Mac HFS+ Disk Support Option Guide.