Released in October 2019, it’s packed with plenty of new features Mac owners should love, like spreading cloud.
The difference between the two is that RAID 4 stores parity information on a dedicated disk, while RAID 5 distributes the parity information. As with RAID 4, data is striped across the multiple component disks in the RAID at the block level. Mirroring generally runs at the speed of a single drive or a bit slower for writes (all drives can be written simultaneously, but there is some overhead).
A RAID-1 mirror can be created in software with two or more independent drives, or via hardware such as a dual-drive unit like the OWC Mercury Elite Pro Dual.
