When i first inserted two different floppies (400k MFS and 800k HFS, under Systems 7. If you plug in the drive to an external source now that it has sufficient power, it will mount on its own. Step 4: Check your USB disk on Mac desktop and open it to get the data. The external drive is not formatted in a macOS-recognized file format. Also, you can copy all the data from the drive to the Mac. Mounting an external hard drive isn't as simple as plugging it in. Essentially the same results on my vintage 2011 MacBook Pro 17-inch with High Sierra installed. Itfailed because "it could not unmount the old HD". I downloaded the Mac version of WD Diag which says the drive is OK. I've tested them on a Macbook Air running macOS Sierra, they also mount fine. External hard drives, thumb drives, USB drives, Flash memory cards, and devices like iPod are examples of storage devices that you can connect to your Mac using Thunderbolt, USB, or FireWire cables, or connect wirelessly using Bluetooth. i managed to install el capitan on the external drive and use terminal to force erase the disk. If the box is checked, move on to fix the external hard drive not showing up on Mac. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.
Enter your system password and hit Enter. Please Read more about Mac hard drive recovery here. Provide a name and a format to format the drive. They've asked me to pull all the data off the hard drive and see if the drive can be initialized and the OS installed.
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