Modify partition size or delete partition within MAC OS X 10.10 System

If you need to modify or delete a partition within an OS X 10.10 system, you need to convert the logical partition first.

　Here's how:

1, restart the computer, press and hold Command-r to enter the system recovery partition.

Select Chinese language to enter.

2. Click the go to Disk utility.

3. When you find that you cannot modify the partition size or delete the partition. You will find that your hard drive type is: Logical file set Logical Volume group.

4. To make sure that the operation is correct, first fix the disk, and then repair the disk file permissions. After exiting the Disk utility, select Tools on the menu bar-open terminal.

5. Enter

Diskutil corestorage List

Make a list of existing disk partitions. The ID used to view the disk

6, enter Diskutil corestorage revert partition ID

Converts a logical partition to a normal partition.

7. You can change the size of the disk after the conversion.

Special reminder, the operation of the risk, please remember to back up the file, after the operation started hold option will be more than an EFI boot. You can ignore it.