If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data). In the sidebar, select a volume, then click the First Aid button. In the First Aid dialog, click Run, then follow the onscreen instructions. When the First Aid process is complete, click Done. Repeat steps 2 through 4 for each volume on the storage device. In the sidebar, select a container, then click the First Aid button. Yes, it does sound very much like a failing hard drive, although there are other things that could cause this sort of behaviour, such as faulty RAM or a failing power supply. Repeat steps 6 through 8 for each container on the storage device. Your best bet is to get it looked at by an Apple certified technician. In the sidebar, select the storage device, then click the First Aid button. If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following. If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk. If you can replace a file or re-create it, delete it. If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted. If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data. If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers. #Disc input output error mac disk image mac If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. #Disc input output error mac disk image how toįor information about servicing your Mac, see Find out how to service or repair your Mac.
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