So it’s better to follow the recommended path to connect your external device(s) to your Mac. That’s why most USB devices are called plug-and-play. It’s easy to plug things in at random times, and usually, our Macs and MacBooks get it right and recognize everything.

Encrypt BackUps for iPhones and iDevices.

Download Photos from iCloud to USB Drive.

Backup iPhone to an External Drive with iTunes.

How To Back Up iPhone to an External Drive Using iTunes or Finder and Terminal.

Use Terminal Commands diskutil list, diskutil info disk, & diskutil eject disk.

Run Disk Utility to Mount, Verify, or Repair Drives.

Update Finder Preferences to show external drives.

Connect the USB device to its own power source, if possible.

Check your USB connections for a snug fit or frayed cables, missing pins.

If using a hub, try using a different port on your Mac for the hub or plugging your external drives directly into the Mac.

Quick Tips Follow these quick tips and get your Mac to recognize and mount your external drives When you wake your Mac up, for whatever reason, your external drive does not wake up. If you have a disk already mounted and your system goes to sleep, it also powers down ports, including USB ports. There are several reasons why your Mac won’t recognize a drive. In many cases, the only way to solve this problem is to completely remove the external drives and then restart your MacBook or Mac several times until the drives finally show up again. It won’t mount at all and acts as if it’s utterly invisible to macOS. This situation often occurs after you initially eject the external drive and unplug it from your computer. When you try to plug in the drive again, your Mac no longer sees it.

Sometimes our MacBooks, MacBook Pros, or Macs don’t recognize our external drives or external thumb drives.

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