Feb 19, 2018 Using Macbook Pro, High Sierra 10.13.1. I have always used a toshiba 1TB external hard drive (compatible for both windows and mac) for my photos and videos. Today when I went to add files to it (1st time since updating to High Sierra) it wouldn't allow me add files, giving me a 'circle backslash symbol'. Under ordinary circumstances, you won't see the firmware password field appear. The firmware password field is only visible if your Mac is booted by some alternative means, like from an external hard drive, a CD or a DVD, or if you boot the Mac in Recovery Mode or Single User Mode.

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Posted by Katrina to Mac Data Recovery on January 7th, 2019

I have a 1 TB WD external HD that won't mount. I connect it via firewire to my MacBook Pro running OS 10.13 High Sierra. My mac sees the drive, it just won't mount. I've also tried to mount it via USB, but again, my system sees the drive, but won't mount it. Does anyone have any suggestion what I can do?

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Generally, when you connect an WD, Seagate, Toshiba, Samsung external hard drive to Mac, it will be automatically mounted, then you can perform read and write operation on it. Alternatively, you can also select the disk and click on Mount to make it accessible by the operating system using Disk Utility.

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However, it may happen that your WD external hard drive won't mount on Mac, usually when you desperately need to access some data stored on it. Remain calm, all data on WD external hard drive is still there. This article will explain how to fix WD My Passport not mounting/showing up/recognized/detected.

WD external hard drive won't mount on Mac, how to fix?

First of all, if your WD external hard drive is listed on the left-hand-side menu of Disk Utility, you can make sure it doesn't have any hardware problem. Why the WD external hard drive won't mount? It is because the file system of the disk has been corrupted, preventing the disk from being accessible on Mac. Just try these solutions below.

Solution 1: Run Disk Utility to repair the WD external hard drive

No matter what problems you are meeting on a disk, First Aid is your first choice to repair it.

Step 1: Launch Disk Utility.

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Step 2: Choose theunmountable WD external hard drive.

Step 3: Select First Aid in the top center and click Run.

Solution 2: Reformat to fix WD My Passport not mounting

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If Sometimes, the Disk Utility may not function as desired. In this situation, the only solution is to reformat the WD external hard drive. But reformatting will remove all data on the disk. In order to avoid data loss, you have to recover lost data from unmountable external hard drive as soon as possible. Best scanner software for mac.

Step 1: Recover lost data from unmountable WD external hard drive on Mac

As the best free Mac data recovery, iBoysoft Data Recovery for Mac is able to recover lost data from unmountable, unreadable, corrupted, inaccessible external hard drive, hard drive, USB flash drive, SD card, memory card, etc. It supports to recover documents, photos, music files, videos, emails on macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/Sierra 10.12/10.11/10.10/10.9/10.8/10.7.

1. Download and install iBoysoft Data Recovery for Mac on Mac. Renew ssl certificate.

2. Launch this program. Select the unmountable WD external hard drive and click 'Next'. The program will start scanning this drive for recoverable files.

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3. After the scanning process finishes, you can click the found files and preview.

4. Choose what you want to get back and click 'Recover'.

5. Go through the recovered files and make sure all desired files are back.

Step 2: Fix WD external hard drive not mounting/showing up/recognized/detected on Mac by reformatting

1. Go to Applications > Utilities > Disk Utility.

2. Select the unmountable WD external hard drive and click 'Erase' on the top.

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3. Provide a name and a format to erase the drive.

4. When finished, you can mount your WD external hard drive on Mac and use it again.

Hope this tutorial can help to fix WD external hard drive not mounting/showing up/recognized/detected on Mac. If you have any question, please feel free to contact us.

Also read: Can't See External hard drive showing up on Mac, What to do?

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