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. and works fine on the M1, M1 Pro, and M1 Max Mac. Moreover, it is a data recovery tool for Mac that supports data recovery for encrypted APFS disks. In addition to external hard drive data recovery, it is also a tool that supports USB flash drive data recovery, SD card data recovery , and so on. It is able to recover deleted or lost data from unreadable/unmountable/formatted/corrupted external hard drives. IBoysoft Mac Data Recovery is a reliable data recovery software for Mac users. Recover data from external hard drive on Mac This post will help you solve the First Aid not working problem and recover lost data from the troubled external hard drive.įirst of all, let's take quick look at what First Aid can do in Disk Utility. Note: Only when you are using the external hard drive as a startup disk and run First Aid to repair it, you could see the error message to ask you to run First Aid from macOS Recovery.ĭon't worry.

Os x error could not unmount disk