Journalling is a failsafe method that prevents unwanted data abnormalities in the disk drive due to a system crash. Journalling is not exclusive to the Mac OS as other operating systems are also capable of having a journalling system. This operating system can either be journalled or not, each with its own pros and cons. The Mac OS Extended is a file system that is also known as HFS Plus. Mac os x extended journaled for mac os x. During installation, the macOS installer decides whether to automatically convert to APFS-without erasing your files. If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). Mac OS Extended (Journaled): Uses the Mac format (Journaled HFS Plus) to protect the integrity of the hierarchical file system. Mac OS Extended Choose one of the following Mac OS Extended file system formats for compatibility with Mac computers using macOS 10.12 or earlier.
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