Click the Apple menu in the top-left corner
Select System Settings
Click General
Click Storage
View the available and used storage on your Mac
Open Finder
Click your Mac hard drive or Macintosh HD in the sidebar
Press Command + I to see storage details
Click About This Mac from the Apple menu
Select the Storage tab
Use Disk Utility if you want to check disk capacity and partitions
Open Spotlight Search with Command + Space
Type Disk Utility and open it
Select your drive to view storage information