Consequently, Mac OS Extended Journaled is often encountered when using older internal drives, legacy external drives, or when formatting a drive specifically for compatibility with older versions of macOS. Compatibility and Usage Context For many years, Mac OS Extended Journaled was the default file system for Mac computers.
Understanding Journal Size in Mac OS Extended Journaled
If you are maintaining a Time Machine backup drive that needs to be readable by multiple versions of macOS, including older ones, this format ensures maximum backward compatibility. It is also worth noting that the file system supports various features common in modern computing, including case-sensitive naming, extended attributes for storing metadata, and robust permission controls for user security.
If you are using a modern Mac with an Apple Silicon processor or an SSD that supports advanced protocols, you will likely encounter the APFS (Apple File System) format, which offers better performance with flash storage. This format is a variation of the older Mac OS Extended (or HFS Plus) system, incorporating a journaling feature that logs changes before they are committed to the main file structure.
Understanding Journal Size in Mac OS Extended Journaled
Traditional file systems, like the non-journaled version of Mac OS Extended, update files directly on the drive. The journal itself is typically a dedicated area of 64 megabytes at the beginning of the disk.
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