
Because most Macs now come with Solid State Drives (SSDs. Remember that when you move a file to the Trash, its storage space doesn't become available until you empty the Trash. Modern versions of macOS, and later versions of OS X, like El Capitan, don’t include the Secure Erase Free Space feature in Disk Utility.
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Move some of your files to external storage, such as iCloud Drive* or an external drive connected to your Mac. For other ways to fix a Mac that wont start, check out our guides How to Use OS X boot options to troubleshoot your Mac and How to fix a Mac that wont start.Check the Users folder on Macintosh HD for any shared files that you no longer need to share.If your Mac is set up for multiple users, remove users that you no longer want to have access to your Mac, or ask them to follow the steps in this article after logging in to their user account. Also check the Users folder on Macintosh HD for any undeleted data belonging to previously removed users.

To delete mail that you've moved to the Trash, choose Mailbox > Erase Deleted Items. Then select the disk and get info to check the available storage, make. Some Mac users may require the ability to erase a disk or erase a hard drive from the command line on Mac OS, a task which is typically performed through the Disk Utility application from the GUI. Access the disk and got to /Users/username location, to delete some files. Then click Target Disk Mode button, when the computer has started up, a disk icon appears on the desktop of the other Mac. Delete unneeded email in the Mail app. To delete junk mail, open Mail and choose Mailbox > Erase Junk Mail. Choose the Startup Disk option in the warning window.Delete unneeded files in the Downloads folder. You can open the Downloads folder from the Dock or by choosing Go > Downloads from the menu bar in the Finder.Delete unneeded media, such as music or movies or podcasts, which can use a lot of storage space.
