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Photoshop would magically create a contact sheet for you. There are actually two download pages, one for windows and one for mac.

The right pane will display information about the selected volume , including size and amount of space used. With the volume you wish to verify and repair selected, click the First Aid button on the top pane. A drop-down sheet will appear, asking if you wish to run First Aid on the selected volume.

Hands-on with Disk Utility in El Capitan: Tool for storage devices gets a facelift

Click Run to start the verification and repair process. The drop-down sheet will be replaced with another sheet that shows the status of the verification and repair process. It will include a small disclosure triangle in the bottom left side of the sheet.

Click the triangle to show details. The details will reveal the steps being taken by the verification and repair process. The actual messages displayed will vary by the type of volume being tested or repaired. Standard drives may show information about catalog files, catalog hierarchy, and multi-linked files, while Fusion drives will have additional items that are checked, such as segment headers and checkpoints.

If there are no errors found, you'll see a green check mark appear at the top of the drop-down sheet. However, you're limited to only performing a verification of the drive while the operating system is actively being run from the same disk.

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If an error is found, First Aid will display an error, but make no attempt to repair the drive. I recommend using the same version of OS X that is installed on your current startup drive. Once you have successfully restarted from the Recovery HD, and have launched Disk Utility, you can use the method above for using First Aid on a non-startup drive to verify and repair the drive.

Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc.

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Updated September 30, If errors are found, the repair process will begin. Some notes on what to expect when using First Aid to repair a drive:. A physical drive has logical divisions, called partitions , that allow different formatting parameters on the same physical drive. Repair permissions! It made sense that repairing permissions on files for which OS X knew precisely what settings should be in place could fix random faults. A printer driver with the wrong switches flipped might not be available to the system; or the driver might be unable to access the printer settings file or temporary print queue directories.

Even so, from all reports, permissions repairs had little real effect for years—it just made us feel better. But in El Capitan, any system file for which Repair Permissions would have restored these settings can no longer be modified during normal operating.

While Disk Utility was never a good option for disc handling, it was an option. This new version of Disk Utility shows a prettier display when launched.


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As in the older versions, the boot partition is selected—the partition on a drive that holds the currently running OS X system. The list is divvied up into Internal, External, and Disk Images.

6 Disk Utility changes in El Capitan | Computerworld

However, instead of selecting the First Aid tab, Disk Utility now shows a variety of basic information about the partition. For other regular volumes, just a yellow Other bar shows occupied space. Disk Utility only shows the division for the current booted volume, however. Where did all the other tools go? Mount toggles to Unmount for volumes that are available in the Finder. You can also click the eject button now next to any mounted volume in the list.

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Select a drive or a partition and click First Aid, and a seemingly much-changed repair operation proceeds. You can erase either a partition or an entire drive. Drives have both a format and a scheme: the scheme controls how the drive is prepared to be used to boot with different operating systems. The several types under Format, whether for a drive or a partition, control filesystem-related issues.