Go to the General tab to know details about the file system of the disk. To check it, just select the partition or the external disk, right-click, and visit its Properties. If you have a newer Mac and a USB drive that supports USB 3.0, everything should run fairly fast.There are different other kinds of file systems that your hard drive can support. Use the arrow keys to select which drive to boot from and then simply press Enter. Anyway, the grey MacBook and Recovery 10.11.2 icons are for my internal OS X and the orange OS X and Recovery 10.11.3 are for the version installed on my external drive.Check that the cable from the hard drive to your Mac is connected properly. Select the drive you want to format and click erase. In disk utility, you will have an internal and external drive.Reboot your Mac to see if it was an open program or app stopping the drive from being detected. Try a different wall outlet if there is one nearby. Change the hard drive power cable if you have a spare. Check the condition of the cable and swap it if you have a spare.
Use An External Hard Drive And Windows Mac And ACheck that the drive is receiving enough power. Make sure your drive doesn’t have or use a power-saving or sleep function. Try attaching the external drive to another computer to see if it works on that one to rule out damage to the drive itself. Some imported drives come completely empty, and while macOS should detect and offer to format them, it doesn’t always work. Change mac address with terminal emulator androidAttach the drive if it isn’t already connected. This should be done automatically when macOS detects the drive, but it doesn’t always work. For that, we need to mount it. By default, it doesn’t display much and the setting to not show external disks may be enabled.If you think the drive works fine, let us see if we can manually attach it to macOS. Use a USB power cable if you suspect this to be the issue.Depending on what you find here, you can troubleshoot either the drive or your Mac.First, make sure Finder will display drive icons. If there are any, First Aid will fix them and macOS should then mount the disk without any further hassle.
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