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Hour 22. System Utilities and Monitors > Task: Creating Disk Images

Task: Creating Disk Images

Disk Copy can create images as well as mount them. This is useful for creating an exact duplicate of software you don’t want to lose or for making a master image to distribute software over a network. For each image you create, you must have enough free space on your hard drive. For example, to create a CD image, you need approximately 650MB free. Currently shipping Apple computers come with at least 10GB drives, so this really shouldn’t be an issue.

There are two ways to generate an image: by copying an existing item, or by creating an empty image file, mounting it, and then copying files to it. To create an empty image file, choose Blank Image (Command+N) from the File menu’s New submenu. The dialog box shown in Figure 22.4 appears.

Figure 22.4. Make a new image, and then copy to it.

Fill in the Save As field as you normally would—this is the name of the image file, not the volume that’s going to be created. Set the name of the volume in the Volume Name field. Choose a size for the image from the Size pop-up menu. There are a variety of preset sizes for common media, such as Zip disks, CDs, DVDs, and a Custom setting for arbitrary sizes.

Next, choose a volume format in the Format pop-up menu. In addition to the Mac OS Standard (HFS), Mac OS Extended (HFS+), and UNIX File System (UFS) options supported as native Mac OS X file systems, you can also choose MS-DOS File System to create a Windows-compatible image.

Finally, if you want to encrypt the disk image, choose AES-128 in the Encryption pop-up menu and click Create. The new disk image is created and can be used immediately.



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