... you'll have to erase all the information on the disk first.) If you leave your Mac on all the time (if you run it as a Web server, for example), it's a good idea to use the journaled hard drive ... of just pulling out the plug). If you didn't shut down properly, Mac OS X examines your hard drive the next time you start up to see if it needs repair. It has to scan the whole drive–which ... what was happening when your computer shut down–and therefore spend a lot less time checking your hard drive. There are some downsides to the journaled format, however. First, this procedure...