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Faulty USB cable or external hard disk enclosure It's because your Mac is busy in dealing with the former device. Consequently, another external hard drive connected to the same USB port can't be recognized.

You may have improperly ejected a storage device last time. But some standard external hard drives can only be plugged in without workability. For example, The Canon Micro USB port looks like the standard ones. Also, you need to know that not all USB ports are the same. Malfunctioned USB portĮxternal hard drives won't show up in Disk Utility when the USB port is not working, being loose or dusty. Then why this time your external hard drive is not showing up there? If you have known how Mac recognizes an external hard drive, it would be easier to understand.īut to make it more simple for you, we list some common reasons for this issue.

Then users can verify, check, repair, erase, partition, rename, encrypt, and unmount volumes and drives there. All connected drives should be listed in Disk Utility. Why is an external hard drive not showing up in Disk Utility?Įxternal hard drive not showing up in Disk Utility will cause panic, because Disk Utility is a built-in disk management program for Mac computers.