Mac failed to modify partition map because of resolution of file system validation failure

Trust a lot of users who do their own partitioning under the Mac, perhaps more or less will encounter "failed to modify the partition map, because the file system validation failed" error message. 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 small part of the heart is half cold, a large disk space to see again, do not know how you feel at this time. The following is a brief introduction to what to do if you encounter such a situation.

1, when encountering the above situation, this is because the Mac OS system internal file system in the authentication error, resulting in the inability to merge the spare partition into the Mac OS partition. Please restart the MAC system and press the Command+s key on the keyboard to enter Safe mode when restarting. If unsuccessful, try a few more times and press the sound before restarting.

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

3. Then enter the FSCK-F command and press the "enter" key on the keyboard to execute the command.

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

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

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

7, restart, and then open the Disk utility, the partition can be merged.