If your erase Macintosh HD from Disk Utility first, Reinstall OS X does a clean reinstall. Theres even a lovely color-coded space indicator. All mounted drives will appear on the left side of the screen, assuming you dont already have your desktop cluttered with files and folders. Bypass the Trash when you delete files Step 3. You should see this: If its not checked, but a check next to Hard disks. How to delete files on your Mac when the startup disk is full Step 1. If you don't erase the Macintosh HD volume, the Reinstall OS X option does an upgrade install, or it downloads an OS X installer and replaces system files with the default versions. Dual-boot users also have the option to reboot into a compatible mounted Mac or Windows startup volume. If not, click on the desktop so the title next to the Apple icon at the upper left says Finder. You can try to do an upgrade install or reinstall OS X from the recovery partition: If the disk with the Macintosh HD volume is shown in Disk Utility, you can try to back it up by pressing the New Image button and saving the dmg file to an external disk. If the disk is not shown in Disk Utility, it could be a hardware issue.Īccording to a related question, resetting the SMC might help. 
The Repair Disk button performs completely different operations depending on whether a disk or a volume is selected. If the Macintosh HD volume or the disk it is on is shown in the sidebar, try repairing them. Disk Utility should normally also show the Macintosh HD volume and disks in the sidebar. Mac OS X Base System is the volume for the recovery system.
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