Mount an external hard drive on Mac Go to System Preferences > Disk Utility. Check that the external disk is listed in the left sidebar. Highlight your hard drive and select Mount. It should now appear under devices in the Finder.
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Connecting the Drive. Plug the hard drive into the Mac using the cable that came with it. Most hard drives connect via USB, so you'll just need to plug the USB cable into an open port on your Mac. You'll typically find at least one USB port along each side of the Mac.
Many external hard drives have USB 3.0 connections, but since MacBooks and Mac accessories rely on the power and data transfer speed of USB-Cs, USB Type-C or Thunderbolt 3 or 4 connections are certainly favorable.
You can boot it from a USB drive as long as it is partitioned properly and has the same version of your copy of OS X.
Use an external hard drive on a Macbook Air device Once you have an adapter, you can then connect the port of the latter to the port of your device. Macbook Air. You will then need to plug in the cord USB of your external hard drive into the corresponding port on the adapter of your device Macbook Air.
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Any drive formatted with HFS+ will work just fine with a Mac that's running High Sierra or later. Neither Apple File System nor HFS+ works with Windows, however. If you plan to use your external drive with computers that run both operating systems, you should consider formatting your drive with the exFAT file system.
Connect the external hard drive to your Mac. Open the Trash by clicking on its icon. Search for the file you want to recover. Right-click on the item and select the Put Back option to restore it to its original location on the external or internal drive.
One of the most popular ways to back up your information is an external hard drive. These units are a great option because they're portable, reliable, easily available and typically have significant storage capacity for the size and price.
Due to the auto-enabled Secure Boot feature, you are not allowed to boot from an external drive in the first place. That's to say, you can't boot from any USB if you set it in Startup Security Utility. Here is how to do this: Force the MacBook Pro to restart and boot into Recovery Mode.
To do this, you will need to use a adapter. Once you have an adapter, you can then connect the port of the latter to the port of your device. Macbook Air. You will then need to plug in the cord USB of your external hard drive into the corresponding port on the adapter of your device Macbook Air.
Simply attach the SATA portion of the cable to your old drive, and the USB end of the cable to your computer, which will allow you to use the drive as you would an external hard drive. As long as it's connected to your system via USB, you can use it for storage.
If you want to set your computer to boot from an external hard drive, you'll need to access the BIOS, which is a control panel that you open by pressing repeatedly a key (usually a function key such as F12) as your computer starts up.
Next, do the following:
You can use any USB disk with your iPad & iPhone—although depending on your disk & mobile device, you might need an adapter cable. Also, the disk needs to be preformatted—you can't format it on your iPad or iPhone. The disk can be formatted APFS, HFS+, exFAT, or FAT32.