Go back to 9L0-415 - OS X Support Essentials 10.9

Question :-

File system journaling records what file operations are in progress at any given moment. This way, if a power failure or system crash occurs, after the system restarts, it will be able to quickly verify the integrity of the volume by "replaying" the journal.
What does the master password do?
What are PPD files responsible for?
How does file system journaling work?
What are the five System Preference categories?

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