Disk Utility can find and repair errors related to the formatting and directory structure of a Mac disk. Errors can lead to unexpected behavior when using your Mac, and significant errors might even prevent your Mac from starting up completely.
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Before proceeding, make sure that you have a current backup of your Mac, in case you need to recover damaged files or Disk Utility finds errors that it can't repair.
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Open Disk Utility
Start up from macOS Recovery, then select Disk Utility from the Utilities window. Click Continue.
If you're not repairing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. Locate your disk in Disk Utility
Choose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility.
The sidebar in Disk Utility should now show each available disk or other storage device, beginning with your startup disk. And beneath each disk you should see any containers and volumes on that disk. Don't see your disk?
In this example, the startup disk (APPLE HDD) has one container and two volumes (Macintosh HD, Macintosh HD - Data). Your disk might not have a container, and it might have a different number of volumes. Repair volumes, then containers, then disksCnet Free Downloads Utilities
For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.
In this example, the last volume on the disk is Macintosh HD - Data.
Click Run to begin checking the selected volume for errors.
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After Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself.
In this example, the repair order is Macintosh HD - Data, then Macintosh HD, then Container disk2, then APPLE HDD. If Disk Utility found errors that it can't repair
If Disk Utility found errors that it could not repair, use Disk Utility to erase (format) your disk.
If your disk doesn't appear in Disk Utility
If Disk Utility can't see your disk, it also can't see any containers or volumes on that disk. In that case, follow these steps:
Apple periodically offers software updates (called firmware updates) that improve AirPort performance, security, and functionality. Here's how to make sure that your base station is up to date.
Before you beginCnet Downloads For Mac
Restart your base station
Open AirPort Utility on your Mac or iOS device, then follow these steps to restart your base station. If you have more than one base station, restart your primary base station last.
Apple Mac Cnet Download Utilities Windows 7AirPort Utility shows a graphical overview of your Wi-Fi network and any base stations connected to it. The primary base station (Home, in this example) is connected to the Internet via your modem or router.
https://cleverrockstar.weebly.com/blog/hss-for-mac-free-download. If you can't restart using AirPort Utility, just unplug the base station for a few seconds, then plug it back in.
Check for a firmware update
Latest updatesCnet Apple News
* Information only. To download and install firmware, use AirPort Utility.
** On Mac computers with OS X Mountain Lion or Lion, use AirPort Utility 6.3.1. On computers with Snow Leopard or Leopard, use Airport Utility 5.6.1, which supports 802.11n models and the original AirPort Express. Apple Mac Cnet Download Utilities SoftwareLearn more
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