If a crash occurs before all the steps are completed, the end result might be cross-linked files, unusable sectors, or any other problem. A file operation as simple as deleting a file could be composed of two or more steps in order to ensure that everything is done properly. Journalling is a failsafe method that prevents unwanted data abnormalities in the disk drive due to a system crash during the middle of a file operation. 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 Extended vs Mac OS Extended(Journaled)
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