external storage

Hey hn1000,

Thanks for asking Apple Support Communities about the storage issue you're having with your Mac. We want to help! You can use your external drive to keep files on to help save space on your Mac: Use external storage devices with Mac

Take a look at the following guides for steps to take to reclaim storage space:

How to free up storage space on your Mac

Optimize storage space on your Mac

Find and delete files on your Mac

We hope this helps. Thanks again, and have a great day!

No, you can’t use external storage. You need to free up space on the startup drive as indicated open the previous post.

For a portable machine like yours this would be an excellent choice: OWC Envoy Pro mini. It can be had up to 1 TB capacity. OWC has an excellent reputation for quality hardware, customer support and warranties.