![]() Once Disk Utility has loaded, choose the disk you wish to repair - the default name for your system partition is generally "Macintosh HD", and choose 'Repair Disk'. Select Disk Utility from the macOS Utilities menu.Reinstall the version of macOS originally found on your computer: Option-Shift-Command-R. 1) Export them to another drive so I have a backup (if you dont already) 2). Restart your Mac, and press Command + R, while it's restarting. Install the latest version of macOS that has compatibility with your device: Option-Command-R. Get to macOS/Mac OS X Utilities, select Disk Utility, and then click Continue.If trying to repair the internal partition where your Operating System is installed, you'll need to boot into Recovery mode, so your Mac can check and repair files that are "in use".If using an external disk, then choose 'Repair Disk', and allow the process to complete. Disk Utility is a native disk management application in macOS that helps manage internal or external hard drives and quickly resolves Macs drive problems.It should give you some diagnosis to confirm whether your drive is viable, or needs to be repaired. ![]() If First Aid failed, then the file system of the startup disk might be corrupted. After First Aid on the startup drive, your Mac should boot as normal. Choose the Run button to confirm that you need to repair this drive. Once you've loaded Disk Utility, select 'Verify Disk' and allow your Mac to check the disk. In the Disk Utility window, select your boot drive and click on First Aid on the top. You can locate Disk Utility within your Applications -> Utilities folder, or by searching "Disk Utility" in Spotlight. This requires the computer to be booted in Recovery mode, and as repairing the internal partition can have serious repercussions, we advise performing a back-up of any crucial data before proceeding. It can also be used on your internal partition if you are having trouble with OS X. The most obvious example would be when there is drive corruption caused by improperly removing external USB storage. Download CtlnaAHCIPort from the downloads section of this forum. To enable an unsupported SATA Controller, follow the steps below. Repairing Disks using OS X's Disk Utility can be a useful way to improve performance, and in some scenarios, recover lost data. The next step is to enable an unsupported SATA Controller so that macOS can find the controller and as a result, macOS will be able to communicate with the disk. To side-step this issue, enable ‘App Store and identified developers’ in the ‘Security. By default, recent versions of macOS block the running of applications from unidentified developers. As much a we all try to protect our computers, sometimes issues do arise with the drives where you store your data. Launch Disk Utility from Applications>Utilities or Spotlight search Insert your USB stick and observe the new device added to Disk Utility.
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