Summary: In this article, we will provide you 7 useful solutions to the issue of Toshiba external hard drives not showing up on Mac. Besides, we will also tell you how to recover lost data from the Toshiba external hard drive with free Mac data recovery software - iBoysoft Mac Data Recovery.

'Toshiba external hard drive not showing up on Mac' is a frequently discussed question in Apple support community. Here's an example.

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I have a Toshiba Canvio 1TB USB 3.0 hard drive. But when I plugged it into my Macbook Pro (mid 2012) it didn't show up. I have tried to swap around the USB connection cords but still not showing up. Read something about the Toshiba sometimes not being able to show up on Mac laptops due to lack of power, I tried using an external powered USB hub still nothing. Can any one tell me why my external hard drive is not showing up on the Mac, and how to fix it?

Why does the Toshiba external hard drive not show up on Mac?

In fact, there are various reasons that could lead to Toshiba external hard drive not showing up on Mac correctly, including file catalog corruption, operating system errors, virus, physical damages, etc. Besides Toshiba, this error can also occur to WD external hard drives, Seagate external hard drives, etc.

Whatever the reason is, it will prevent you from accessing the files stored on it.

How to fix Toshiba external hard drive not showing up on Mac error?

Solution 1: Do some basic checks

If your Toshiba external hard drive doesn't show up when connected to a Mac via USB port, follow the troubleshooting ideas below.

1. Toshiba external hard drive is not correctly powered.
Fix: Try to connect it to an external powered USB hub.

2. The USB cable is damaged.
Fix: Try a different USB cable.

3. The USB port is damaged.
Fix: Try a different port or a different computer.

Most of the time, you can see the Toshiba external hard drive showing up on Mac again after these checks. If not, let's move forward.

Solution 2: Show the Toshiba external hard drive on the desktop

Usually, a correctly connected external hard drive will show up on the desktop, in Finder and Disk Utility. If you can't see it, just check the settings of your Mac.

Step 1: Click Finder on menu bar.

Step 2: Go to Preferences > General tab.

Step 3: Make sure the 'External disks' option is ticked. If not, tick the box before it.

This operation will show the Toshiba external hard drive on the Mac desktop.

Solution 3: Show the Toshiba external hard drive in Finder

Step 1: Go to Finder > Preferences > Sidebar tab > Locations.

Step 2: Make sure the 'External disks' option is ticked.

Solution 4: Mount the Toshiba external hard drive in Disk Utility

Sometimes, the connected external hard drive shows up in Disk Utility but not mounted. In this case, you can try to mount the drive manually.

Specifically, you can click on the Mount button on the top of the window, or hit the Mount icon beside the drive.

Solution 5: Fix the Toshiba external hard drive in Disk Utility

However, if theToshiba external hard drive is unmountable in Disk Utility, the file system of the drive may be corrupted. You need to fix it with First Aid.

Step 1: Go to Utilities > Disk Utility.

Step 2: Select the unmounted Toshiba external hard drive and click First Aid on the top of the window.

Step 3: Wait till the verification and reparation process ends.

Solution 6: Reformat the Toshiba external hard drive

IfFirst Aid failed on external hard drive, the drive must be severely damaged, logically or pgysically. In this case, you can firstly try to fix the drive by reformatting, which is able to fix logical errors like file system corruption, partition table corruption ,etc.

Note: Reformatting a drive will erase all the files stored on it. In order to avoid unwanted data loss, it's necessary to recover lost data from the not showing up Toshiba drive in advance.

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Tutorial to recover dat from the Toshiba external hard drive with iBoysoft Mac Data Recovery.

Step 1: Download, install and launch iBoysoft Mac Data Recovery.

Step 2: Select the not showing up Toshiba external hard drive and click 'Next' button. This program will start scanning for lost data.

Step 3: Preview the searching results, choose files you need, and click 'Recover' to get them back.

After recovering data from the Toshiba external hard drive, you can reformat it in Disk Utility now.

Step 1: Select the Toshiba external hard drive in Disk Utility sidebar.

Step 2: Click Erase on the top of the window.

Step 3: Follow the instructions to finish the reformatting process. Specifically, you need to provide a Name and a Format according to your preference.

After the process finishes, you will hopefully see the Toshiba external hard drive showing up on Mac correctly.

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Solution 7: Send the drive to a disk reparation center

If you have tried out all the solutions above with no luck, the Toshiba external hard drive could be damaged physically. You have to send it to specialists or replace it with a new one.

Conclusion:

Toshiba external hard drive is widely used in our daily lives to store tons of different files. Once it can't be shown up on your Mac, there're solutions for you to recover lost data with free Mac data recovery software, like iBoysoft Mac Data Recovery, as well as to fix the error through simple steps.

A bonus tip: To keep the security of your data, you should back them up regularly via Time Machine or on another external drive.