Live streaming apps for mac. How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac. ![]() Speculation initially pointed to a reliability issue with converting existing Fusion drives to the APFS format. But the real issue may be a performance hit taken by the hard drive component of the Fusion pair. One of the features of APFS is a new technique to ensure data protection called Copy-on-Write. Copy-on-Write keeps data loss to a minimum by creating a new copy of any file segment that is being modified (write). It then updates the file pointers to the new copies after the write is successfully completed. While this ensures data is protected during the write process, it can also lead to a great deal of file segmentation, scatter parts of a file around a disk. On a solid-state drive, this is not much of a concern, on a hard drive, it can lead to.
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