Apple Mac is operating system used on apple devices to and by storing temporary files and downloads and many more places store such files which can be deleted without creating any serious issue to operating system. If after following procedure and deleting files still getting disk full on Mac OS X then you need to add and additional disk or you need to move files to an external disk.
If you are not able to open finder on your mac or the mac is not responding you can read blog here: how to fix finder not responding issue on Mac. But to deal with disk full error you need to follow below mention steps to treat disk space issue in Mac computers and laptops. Follow step by step instructions to fix startup disk full error on Mac OS.
METHOD1: EMPTY OUT THE TRASH
Step1: Right click trash button and press command button.
Step2: Trash icon will now be secured empty trash click that it will delete complete trash.
METHOD2: CLEAN DOWNLOADS
Step1: Open downloads folder and check the files not in use or not used from a long time.
Step2: Select all the files indicated in first step of method 2 and delete them.
Step3: Repeat all the steps for music and videos folders too.
METHOD3: CLEAN DESKTOP
Step1: Clean all unnecessary applications not needed and if some needed store them in a dedicated folder.
Step2: Try not to store many things on the desktop and remove temporary files from the desktop.
METHOD4: DELETE OLD ITUNES BACKUP
Step1: Open iTunes folder and check for latest version in preferences.
Step2: After updating search for files holding old or previous heading and delete them.
METHOD5: REMOVE OLD IOS BACKUPS
Step1: Open finder and search for backup files.
Step2: Delete all the entries heading with backup.
METHOD6: REMOVE LOCALIZATION FILES
Step1: Open finder locate application.
Step2: Press control and left click on applications at the same time.
Step3: Now choose show package content and delete all unwanted language files.
If on following complete steps given in blog above startup disk full error in MacBook is not resolved on Mac you can contact an expert. Get in touch with Apple support phone number round the clock and get help online. A team of expert certified tech professionals is working here online to fix the disk space error on Apple Mac computers with best approach.