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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