Not able to expand the hard drive partition after deleting Windows

hard drivepartition

I'm a MacBook user and I had previously installed Windows on my laptop.

After deleting the Windows partition now, I'm facing difficulty in expanding my hard drive partition to the maximum. After I drag the the partition to Full and click Apply, it shows:

Checking journaled HFS+ volume

Then, a message pops out:

Partition failed with the error : couldn't modify partition map because file system verification failed.

What should I do?

Best Answer

Try this:

  1. Reboot the Mac into Single User Mode by holding ⌘ (Command) + S when pressing the power button.
  2. When the command prompt finally appears, type: /sbin/fsck - fy
  3. After this is completed, type reboot or exit.
  4. Wait for Mac to start up normally.
  5. Back in Disk Utility, hit Verify Disk, then try and partition as normal.
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