Hopefully, the command has helped you fix file system errors on your external hard drive. Remember to replace disk3s2 with the Device name of your external hard disk too. For example, type fsck_msdos for FAT file system and type fsck_exfat for exFAT file system. Tips: Remember to replace "hfs" with the file system on your external hard disk. You need to exit the operating system and reboot into Single User Mode.
However, unlike CHKDSK command in Windows, you can't run FSCK command inside the operating system. Therefore, if running First Aid on Macintosh HD failed or Macintosh HD could not be repaired in Disk Utility, you can also run FSCK command to repair the startup disk. FSCK command can be run to repair a boot disk or a non-boot disk. It can check the file system and try to repair the damages it finds.
Solution 2: Run FSCK command from Single User ModeįSCK (File System Consistency Check) is Mac and Linux version of CHKDSK command in Windows. If you are receiving a constant result saying the process has failed, you can move to the next solution. Therefore, there might be a hope that it works after you rerun it. First Aid will try to verify and fix the content on the selected volume every time. On Apple's official Support page, users are encouraged to run First Aid more than once. We have concluded three methods for you to try one by one, hoping they can repair the corrupted external hard drive successfully without losing data.
Generally speaking, if you can't run First Aid on an external hard drive to repair it, the solutions left for you to repair the corrupted external hard drive on Mac are limited. How to fix the corrupted external hard drive on Mac In the next section, you will learn what to do if the First Aid repairing process has failed on external hard drives. Most of the time, First Aid's failure on external hard drives is due to severe disk corruption which was brought about by improper ejection, physical damage, virus infection, or other reasons. It has the capability to detect and repair the damages to partition map, master directory block, device driver, and so on.īut why did Disk Utility's First Aid would fail on external hard drives? Read more > What does First Aid do in Disk Utility?įirst Aid in Apple's Disk Utility is a small utility designed to verify and fix minor problems of a drive, such as repairing the drive's data structures, fixing external hard drives not mounting on Mac, and external hard drives not readable on Mac and so on. Recover Files Disappeared from External Hard Drive on MacĤ methods to recover disappeared/missing/deleted/lost files from USB external hard drives and SD memory cards on Mac computers with free Mac data recovery software.
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