What is the Mac OS Journaled File System?

Glyph HDD-centric drives come preformatted for Mac using a journaled file system called "Mac OS Extended (Journaled)." Mac OS X (used to, now it's APFS) incorporates journaling by default, which will automatically maintain file system transactions in a separate log file. If your computer crashes and a restart is required, the OS will then use the journal file to help fix the damaged file system. Mac OS X 10.3, 10.4 and 10.5 ship with journaling on by default, and volumes with journaling enabled can be used by older versions of the Mac OS. Glyph drives with journaling enabled can be fully used with Digidesign Pro Tools and other DAW software. Glyph recommends that all users reformat Glyph drives with journaling enabled using Apple's Disk Utility software. More here:

What is Mac OS Extended Journaled & How to Format?