How to format an external hard drive or flash drive If you want to re-format an external hard drive (a drive you plug into your computer, instead of installing inside of your computer) or flash ...

How to Format SSD on a MacBook. A Solid State Drive is primarily used on laptops and other lightweight devices, as its compact size proves adequate for such portable hardware units.

While the Mac can use a hard drive formatted for Windows, some features may be limited. So it's a good idea to format a new hard drive specifically for macOS.