Unable to mount external HD on Mac

Hello again,

Unless it wasn't clear, I am trying to recover my external HD...

The volume   could not be repaired.

Your options are reformatting the Parent drive. This will erase all data.

You have an option to take it a Data Recovery Service.

https://www.popularmechanics.com/technology/gadgets/how-to/a3086/hard-drive-recovery/

Well, possibly DiskWarrior...

https://www.alsoft.com/DiskWarrior/

Wow, great news, thanks for the report! :)

DiskWarrior is worth it's weight in Gold.

Mounting a hard disk or drive disk simply means to make the disk available for macOS to perform read and write operations on it. Usually, mounting is an automatic process and happens when the hard drive is connected with your Mac computer. Hard-Drive mounting can be done manually using Disk Utility found under Utilities folder. If everything is working fine on the disk, it should be visible on the left-hand-side menu of Disk Utility. Select the disk and click on mount to make it accessible by the Mac operating system.

Major Mounting Issues on Mac:-

1.Incorrect Formatting of the Disk

2.Corrupt Disk

3.Unsafe Removal of the Disk

4.Power Failure

5.Connecting Hardware

Steps to Resolve the Hard-Disk Mount Issues:-

One of the most commonly used solution to resolve the mount issue is to simply restarting the Mac computer-system and then simply connecting the disk again to check. If this does not solve the issue, Disk Utility can become a handy tool to resolve this Mac hard disk drive mount problem.

1.Follow the below listed steps of checking whether the Mac hard drive or disk is properly connected to the system and powered on whenever required.

2.If the disk or drive is still visible in Disk Utility but it did not mount, select the drive and click on Verify Drive. This will check the disk for any errors on the disk that can be repaired. If any errors are detected, further click on the Repair Disk to attempt repair of issues found. If this completes successfully, remove the disk and connect it again.  

3.If above procedure did not work for you to resolve this problem, “live verification” can be performed to fix the issue. Shutdown your Mac computer and keeping the disk connected start the system. While the system boots, press Command+R. A menu will be displayed from where Disk Utility can be selected. Select the disk and follow the procedure mentioned in second point.  

4.Sometimes, the Disk Utility may not function as desired. In this case, it can be accessed from the Terminal as follows:

· Go in the Applications > Terminal

· Enter: diskutil list (This will list out the available volumes)

· Check the volume indetifier from the table that appears.

· Enter: diskutil repairVolume [diskvolume identifier]

After performing the above steps, you will be able to resolve this Mac hard disk or drive mount problems and further access all the files and folders quite easily.

I agree. I sometimes hesitate to suggest it because it’s not cheap. But it is dirt cheap compared to what you might spend on data recovery or redoing lost work or lost backups. I consider it an essential part of my toolkit. You may not need it often, but when you do, it can save you time, aggravation, and money. It is far more capable of fixing directory problems than Disk Utility.

Data Rescue is another app that you won’t need often, with any luck. I really like that the demo will give you an idea of what can be recovered.

Except if it's a little WD USB3 drive with proprietary interface on the drive. :(

Yeah, there’s that horrible possibility. Yet another reason to just roll your own external.

Yes indeed to all you say. :)

Disk Warrior is certainly worth a try. Another option is the Prosoft Data Rescue app. It is also possible that something has gone wrong with the enclosure or cable, so if all else fails, you could consider dismantling the enclosure, and then try the drive in a dock or a better enclosure.