I recently upgraded my computer to Mavericks (I believe I have the latest version, 10.9) and I've been trying for 2 days now to install Windows via Boot Camp on my computer, but it always fails at the Partitioning step.

I have tried multiple different things, such as…

  • Partitioning via Disk Utility
  • Going into the Recovery HD and trying to repair the HD
  • /fsck/sbin -fy in Single-User mode
  • I have used a Mountain Lion USB install to use the Disk Utility there

…but I keep ending up with the same errors:

  • Partition map is broken
  • Verification of the file system failed

When I try to repair it using Recovery HD I keep getting "Live file system repair is not supported" and there is basically no way for me to partition, unless I want to downgrade to another version of OS X which I don't feel like doing. Any ideas?

2 Answers 2


This indicates that the partition map on the drive is corrupt and needs to be repaired.

  1. Backup all your data (possibly with a disk image of your startup disk partition) and boot into a separate disk (not Recovery HD).

  2. Select your drive in Disk Utility, and choose the Partition tab.

  3. Change Partition Layout to 1 Partition or 2 Partitions. This will erase the entire disk, replacing the corrupt partition map with a new one.

  4. Click Apply.

  • would booting into a mountain lion usb installer work? Commented Nov 27, 2013 at 18:40
  • @SimonAndersson Yes it should
    – grg
    Commented Nov 27, 2013 at 18:41
  • also what's the best way to backup my data if i don't have an external harddrive? :S the biggest USB i have is 32 gigabytes Commented Nov 27, 2013 at 18:42
  • @SimonAndersson This process will erase all data from your drive, but if you're lacking space, don't back up data you don't need (e.g. /System as they'd be replaced when you reinstall OS X).
    – grg
    Commented Nov 27, 2013 at 18:48

I solved this without erasing my harddrive by just booting into single-user mode and repairing the actual Macintosh HD Partition, instead of the whole harddrive.

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