Hard Disk Headaches
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The Mac s hard disk holds all of your information, as well as the OS X operating system In other words, it is the central storage location for everything on your Mac When the operating system runs, it uses files stored on the Mac When you use an application or open a file, that information is taken from its storage location on the Mac The good news is that the hard disk is tucked away inside of the Mac and, as a general rule, you don t have to worry about it all It takes care of itself and works when you need it to However, there is always the potential for problems With that in mind, OS X gives you a Disk Utility, formerly called Disk First Aid in OS 9 and previous versions of Mac operating systems The Disk Utility program can repair most problems with the Mac hard disk Additionally, you can use a UNIX command line utility called fsck (which means File System Check) that does the same thing So, how do you know if you need to use one of these tools No hard rules apply, but you can bet you have a hard disk problem if your Mac freezes during startup, if you see a text command line during the startup process, if your application icons turn into folders, or if you experience other unexplained hiccups and error messages When in doubt, run either the Disk Utility or fsck utility to fix the problem; the following two headaches and painkillers show you how
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CHAPTER 6: Disk Headaches
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I don t know how to use the Disk Utility
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Cause You can find the Disk Utility in Macintosh HD | Applications | Utilities If you double-click the utility, you can find information about the hard drive and can click the First Aid tab Here, you can verify disk permissions and repair them, as shown in the following illustration If you need to repair the disk, restart the Mac using your OS X installation CD Disk Utility cannot repair a disk that it resides on, so you have to run the Disk Utility from the installation CD The painkiller shows you how
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To repair the disk, follow these steps:
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1 Put the Mac OS X CD in the CD drive and restart the Mac
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Hold down C when the Mac is restarting
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2 When you finally see the installer window, click Installer |
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Open Disk Utility
Mac OS X Headaches: How to Fix Common (and Not So Common) Problems in a Hurry
3 When the Disk Utility appears, select the Macintosh HD (or any drive that
is causing the problem) in the left pane and then click the First Aid tab in the right pane
4 You can click Verify Disk if you want the utility to check for disk problems
If you already know problems exist, just click Repair Disk
5 The repair process begins It may take some time for the utility to check
everything, but eventually the process ends If you see a final message telling you The Volume Macintosh HD Appears To Be OK, then everything with your disk has checked out and has been repaired The last line says Repair Complete whether anything was actually repaired or not
6 Click Disk Utility | Quit Disk Utility 7 Click Installer | Quit and then click Restart in the box that appears
This tool is great to use when a problem occurs, but it is taxing on the hard drive In other words, don t run the Disk Utility every night as preventative maintenance
I can t find my installation CD-ROM, or I want to check my disk using fsck
Cause An alternative to using the Disk Utility is to use the fsck command line tool It does the same thing as Disk Check, but you just don t have a pretty interface to look at In truth, the Disk Utility is just a graphical interface for the fsck tool, so think of them as exactly the same This tool is great to use if you would rather work at the command line anyway, or in the event that you can t put your hands on your OS X installation CD-ROM in order to run the Disk Utility Don t worry; fsck is very easy to use The painkiller shows you how The Painkiller To run fsck, follow these steps:
1 Restart the Mac When the Mac starts to boot, press COMMAND-S This
starts the Mac using the command line You see white letters on a black background When the Mac is finished, you see a white box at the end of the text where you can enter a command (your mouse will not work here, only the keyboard)