In addition to the protective side of things discussed above, is the fact that a HFS filesystem has all the Mac OS X hooks built in for automated indexing, backup, version control and so on that would not be possible on a FAT32 enabled filesystem. This is far faster than simply running a chkdsk or similar command to check the entire filesystem for problems which you would need to perform on a FAT32 file system. In this way it can examine the log on a restart and work out of there are outstanding changes that were never completed. Particularly if you use any form of caching, the data may be waiting to be written to the disk at the point of removal, thus losing your data.Ī journaled filesystem helps to prevent too much damage in these scenarios by keeping a log of all changes it needs to apply, and noting when they are successfully completed. As such you run a greater risk of changes that need to be written to the drive failing to complete should you remove the drive too quickly, or without following the correct eject procedures. If the disk uses the Master Boot Record (MBR) partition type, some partitions may not be available for use with Time Machine. It's not possible to remove your laptop drive and keep the OS running, but perfectly possible with something USB or Firewire attached for example. Time Machine still supports backups on Mac OS Extended format (Journaled), Mac OS Extended (Case-sensitive, Journaled), and Xsan formatted disks. Taking that to one logical end, an external drive is by definition more likely to be removed from the system than an internal drive. In the event of a system crash or power failure, suchįile systems are quicker to bring back online and less likely to I include the following Wikipedia quote as there is no point re-inventing the wheel:Ī journaling file system is a file system that keeps track of theĬhanges that will be made in a journal (usually a circular log in aĭedicated area of the file system) before committing them to the mainįile system. One of the main issues of APFS is that Macs running older versions of macOS cannot access it. ![]() The main benefit of Mac OS Extended is reverse compatibility. Taking aside the part that says which OS a particular filesystem is associated with, the main point is the word "journaled". Although APFS is much faster and more reliable, there are still a few reasons you may want to use Mac OS Extended.
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