External hard drive is not mounting in High Sierra, how to recover data?

Posted by Juno to Mac Data Recovery on January 26th, 2018

One of the issues reported by macOS High Sierra users in Apple support communities is external hard drive not mounting in High Sierra. Sometimes, when external hard drive can't be mounted in Finder, they can still be found in Disk Utility. But there are also times that the external hard drive can neither be found in Finder nor in Disk Utility.

'External hard drive is not mounting in High Sierra' error may be caused by many factors. In general, the reasons are corrupted or damaged file system, unsafe ejection, sudden power outage, virus infection or other improper operations.

No matter what causes this error, after we found unable to mount external hard drive on Mac in High Sierra, the first and most important thing is to get lost files back. Only with a reliable Mac data recovery software, we can recover lost files. iBoysoft Mac Data Recovery is a free & professional Mac data recovery software that can recover data from not mounted external drive on High Sierra.

Tips for recovering data from not mounted external hard drive

Before performing data recovery from the not mounted external hard drive, we should avoid making any further operation on the external hard drive. That's because those further operations may not only make physical or logical damages to the drive, but also will write data to the drive. The new data is very possible to cover the original files and make them unrecoverable.

Recover data from not mounted external hard drive with iBoysoft Mac Data Recovery

iBoysoft Mac Data Recovery is a reliable Mac data recovery software that can recover data from not mounted external hard drive, recover deleted/lost files from external hard drive, recover data from formatted external hard drive, recover data from corrupted external hard drive, recover data from unreadable external hard drive, recover deleted/lost partition from external hard drive, etc. on macOS Mojave 10.14 and earlier.

Aside from above, iBoysoft Mac Data Recovery can also recover data from not mounting APFS external hard drive, recover data from not mounted USB flash drive, recover data from not mounted SD card, recover data from not mounted pen drive, etc.

Tutorial to recover data from not mounted external hard drive on High Sierra with iBoysoft Mac Data Recovery

Step 1: Launch iBoysoft Mac Data Recovery.

Recover data from not mounted external hard drive on High Sierra

Step 2: Select the not mounted external hard drive and click "Next" to scan all lost files.

Step 3: Preview scanning results, choose files we need, and click "Recover" to get them back.

Step 4: Have a check to ensure we have got all lost files back.

Still have questions?