0, and newer versions of Windows), and Mac OS X (version 10. It is strongly recommended that all users backup their data, dismount, and then remove any external drives before installing any update. Step 2: Fix Toshiba external hard drive not mounting on Mac by reformatting.If the external or USB hard drive is still not showing up (WD external hard drive or Toshiba hard drive is not showing up in File Explorer), your next step is to open Disk Management and check.Next click on “Device Manager” then expand “Drives”. When finished, you can mount your Toshiba external hard drive on Mac and use it. In the start interface, there are 6 data types for you to choose from. 0 external hard drives are the perfect storage solution. 3, it has been possible that mismatched firmware and operating system updates could lead to hard drives becoming invisible that are hooked up while the update is being installed. Toshiba's Canvio external drives have just gotten a hefty boost, most of all for data swappers that play both the Mac and PC sides of the computing fence.
