TAILIEUCHUNG - Utilities: Your Mac OS X Toolbox phần 2

Tip: After you double-click a disk image, click Skip in the verification box that appears. If something truly got scrambled during the download, you'll know about it right away | Tip After you double-click a disk image click Skip in the verification box that appears. If something truly got scrambled during the download you ll know about it right away your file won t decompress correctly or it ll display the wrong icon for fact you can make Disk Utility always skip that verification business which is a relic from the days of floppy disks. To do so choose Disk Utility Preferences and turn off Check images on locked media. You can create disk images too. Doing so can be very handy in situations like the following You want to create a backup of an important CD. By turning it into a disk-image file on your hard drive you ll always have a safety copy ready to burn back onto a new CD. This is an essential practice for educational CDs that kids will be handling soon after eating peanut butter and jelly. You want to replicate your entire hard drive complete with all of its files programs folder setups and so on onto a new bigger hard drive or a new better Mac using the Restore feature described earlier. You want to back up your entire hard drive or maybe just a certain chunk of it onto an iPod or another disk. Again you can later use the Restore function to complete the transaction. GEM IN THE ROUGH The Sparse Image One of the coolest Disk Utility features is also one of the most buried. Turns out you can make a nice hermetically sealed password-protected disk image that starts out small but magically increases as you stuff more files into it. If the usual disk image is like a steel bucket a fixed size forever a sparse image is like an elastic bag. Choose File New Blank Disk Image. In the resulting dialog box name the file you re creating which you ll double-click to make the virtual disk appear as well as the virtual disk itself. From the Volume Size pop-up menu choose the maximum size this disk image will ever be. The beautiful part is that it will probably never occupy that much disk space it starts out small and slowly expands only as

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• Utilities Your Mac OS X Toolbox phần 2