This thing is still unknown for many users but doesn’t worry it’s not complex. You can format the external hard drive or USB drive to make it compatible with both Mac and Windows machines. Under the hard disk options, choose “Do not add a virtual hard disk.” After your machine is created, open up the Settings for the VM and choose Storage. The physical hard drive, the actual hardware, is the exact same and will work on a Mac and Windows PC both. A “Mac hard drive” is formatted using HFS or HFS+ while a “Windows PC hard drive” is either FAT or NTFS. You see the only difference between a “Mac hard drive” and a “Windows PC hard drive” is the file system. How On Windows Open Hdd For Macbook Air.