Recently I noticed something strange on my Retina Macbook Pro with OS X 10.8.2 (Mountain Lion):
- the available disk space stats gives wrong information (less free space than expected)
- cannot use Boot Camp to create windows partition (says disk needs to be repaired using Disk Utility)
As instructed by Boot Camp, I went to Disk Utility, select the “Macintosh HD” partition and clicked on “Verify Disk”, then I got a whole bunch of logs and it ended with these error messages:
Checking volume bitmap. Volume bitmap needs minor repair for orphaned blocks Checking volume information. Invalid volume free block count (It should be ######## instead of ########) The volume Macintosh HD was found corrupt and needs to be repaired. Error: This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key and the R key until you see the Apple logo. When the Mac OS X Utilities window appears, choose Disk Utility.
Okay, that’s strange right? I then followed the instruction, restarted my macbook while holding down command+R, went to recovery mode and opened Disk Utility again, clicked on “Verify Disk” and bam, the whole process finished in less than a second, no error found! “That’s great”, i thought. To verify, I restarted OS X once again, went back to Disk Utility and verified the partition once more. Guess what, I got the same error message again! I googled around for the past day, people have been suggesting to use 3rd party software to repair disk, re-install OS X or even replace the hard drive. But to me, this doesn’t seem to be that big of a deal, there must be something very simple that I’ve missed somewhere…
Just to save you from reading more of my ramblings, here’s what I did to solve this problem:
- Go to “System Preferences” – “Security and Privacy”, click on “FileVault” tab, click the lock icon on the bottom left to unlock, and then click on “Turn Off FileVault”. The decryption process will take a while (around 1 hour).
- When the decryption is done, reboot into Recovery HD
- Use Disk Utility to verify OS X Partition, this time the process will take much longer and it will give you the same error message
- Click on “Repair Disk”
- (optional) re-enable FileVault