MAC cannot partition because file system verification fails

Very often users will be able to partition the Mac computer, but many people have encountered the "failed to modify the partition map, because the file system authentication failed" error prompt. Some may be installed before the bootcamp version of the Windos system, now want to delete, but also deleted. When you see this error situation, the heart of the small weave is half cold, a large disk space and see, do not know how you feel at this time. The following is a brief description of how the Mac cannot be partitioned because of failed file system validation.

1. When encountering the above situation, this is because the Mac OS system internal file system in the validation error, resulting in the inability to merge the spare partitions into the Mac OS partition. Please reboot the MAC system and press the Command+s key on the keyboard to enter Safe mode during reboot. If not, try a few more times before restarting to hear the sound.

2, then you will see on the screen a string of notes in the beating, when not moving, press the keyboard "enter" button, appear command prompt, as shown in the picture

3, then please enter the Fsck-f command, and press the keyboard "enter" key to execute the command.

4, then please wait for the repair file system, repair speed will be based on the speed of the hard disk, as shown in the figure

5, when the repair is complete and see the screen prompts "the volume Macintosh HD was reaired successfully", the description has been successful, as shown in the figure

6. Next, please enter the reboot command to restart the computer from Safe mode.

7, after the restart, and then open the Disk tool, the partition will be merged.