After updating to macOS Sierra, your external hard drive is not mounting by Mac OS X 10.12. You have checked in Disk Utility and are able to read the drive. What could have made the eternal HD unmountable on Mac? There are numerous reasons due to which external drives refuse to mount on Mac OS X. Some of the most common ones are listed here:
When the external hard drive fails to mount, use the proficient REMO data recovery tool to perform unreadable external hard drive Mac recovery. After successful data recovery, use the Disk Utility to reformat the unmounted external HD and make it workable again.
Easily recover data from external hard drive that won't mount on Mac using Remo Recover
REMO data recovery tool is especially designed for recovering files from Apple Macintosh system. The tool throughly scans the entire drive to restore all lost or deleted files from non-booting external / internal hard drive. It enables to create the disk image of the drive by skipping the bad sectors on the drive. So that you can easily recover data from this disk image file.
In addition, Remo Recover supports recovery of deleted files of any file format. Further, the software is capable of retrieving files from hard drives formatted with HFSX, HFS+, HFS, FAT and ExFAT file systems.
External hard drive brands supported: Western Digital, Maxtor, Samsung, Transcend, Buffalo, Toshiba, Seagate, Hitachi, Kingston and more.
To recover data from external hard drive that won't mount, you need to download free trial version of Remo Recover software. Then, install the tool on a Mac or Windows computer and follow the below guide:
Step 1: Connect the external hard drive and launch Remo Recover tool. Then, click “Recover Volumes/Drives” option to recover data from unmountable external hard drive Mac.
Step 2: The tool shows the list of physical devices present on your computer, select the external drive connected and click “Next” to start scanning the drive.
Step 3: Once the external drive scanning process is done, you can view the recovered file list by means of “Data View” or “File Type View”.
Step 4: Click on “Save” button to save the current recovery session of unmountable external hard drive in order to avoid re-scanning of the drive.
More advantages of using REMO Mac data recovery software
REMO Mac data recovery tool is capable of restoring data lost after hard drive crash, failure and OS reinstallation. It is inculcated with advanced algorithms to retrieve data from failed Apple drives including common causes like:
Other unique traits of Remo Recover includes: