- #USB DRIVE MAC UNMOUNT DISK ERROR HOW TO#
- #USB DRIVE MAC UNMOUNT DISK ERROR FULL#
- #USB DRIVE MAC UNMOUNT DISK ERROR MAC#
On M1 Macs, press and hold Command + R during restart, and then choose Utilities, and Terminal. On older Macs, press and hold Command + S when hearing the startup sound.
#USB DRIVE MAC UNMOUNT DISK ERROR MAC#
Restart your Mac and boot into Single User mode. This method might seem a little complicated, but as long as you follow the guide step by step, it's actually simple to use. When the First Aid fails, you can try to use the command line as an alternative. And wait for the new round of First Aid repair to be finished. Choose the disk you need to repair, click First Aid at the top bar. After your Mac is turning on again, go to Applications > Disk Utility. Then your Mac will restart automatically, please wait with patience. Click Restart again when the confirmation alert appears. Click the Apple icon from the menu bar and select Restart. Because a simple retry could solve the temporary First Aid failure. Surprise! This is the official suggested solution for all users who have encountered the macOS can't repair disk issue. Restart the Mac and Repair the Disk with First Aid Again But for your sake, it is still recommended to make a backup of your disk. Generally, the methods we introduced here won't cause data loss.
#USB DRIVE MAC UNMOUNT DISK ERROR HOW TO#
How to Fix Disk Utility Can't Repair the Disk?Īll in all, there are three ways you could try to fix this problem. In this situation, all you can do is to back up the disk data as much as possible or to recover the data using data recovery software. In another case, if your disk is badly damaged and is beyond the repair ability of First Aid, you would also see the error message. Besides the internal hard drive, First Aid failure can also occur with a USB flash drive, SD card, or external hard drive. This usually happens when you try to fix the Macintosh HD, and the error message you receive could also be "The volume Macintosh HD could not be repaired". In one case, the reason why Disk Utility stops repairing is that the First Aid failed. To further describe the problem, you have received the error message, but you still can open or copy files on the disk, you just can't save changes to files on it. On some occasions, when you try to repair the disk with First Aid, you will receive an error message saying "Can't repair the disk". It can be applied to various scenarios, like apps breakdown, file corruption, external device damage, or computer won't start up normally.īut you should also know that Disk Utility can't detect or repair all disk problems. Overview of macOS Can't Repair the Diskįirst Aid in Disk Utility is designed for users to repair the disk and other storage devices. Disk Utility enables users to mount and unmount external drives that Finder has trouble mounting, format flash drives, and hard drives to a specific format, check and repair disk errors. Some might equal Disk Utility to Disk Management in Windows system.
#USB DRIVE MAC UNMOUNT DISK ERROR FULL#
Full stepsĭisk Utility is a macOS built-in tool for disk erasing, formatting, and emergency repairing.
Get another empty external hard drive as. Restart your Mac and boot into Single User.
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