How do I format a hard drive? A computer hard drive stores your files, allowing you to access them at any time. The majority of the time, you want these files to remain stored properly and safely. … ...

3. In the list of hard drives, right click the drive you want to format. In the pop-up menu, choose "Format…" 4. In the Format window, choose the file system you want to use.

1. If you haven't already done so, insert the SD card into your Mac's SD card slot or USB card reader and boot up the computer. 2. Open "Finder," then click on the "Go" tab.

Right clicking on your chosen SD card drive will provide a list of options with ‘Erase’ listed at the bottom. ‘Erase’ is the option we will select to format our SD card on Mac.

A fresh format is also a handy solution if your USB drive is not showing up on Windows, or is acting unreliable. Plug in your USB thumb or hard drive to your Windows computer.