Boot Camp Assistant: "Your startup disk cannot be partitioned..."

When attempting to partition your Intel-based Mac's disk with Boot Camp Assistant you may receive the message:

"Your startup disk cannot be partitioned because verification failed. Start up your Macintosh from a Mac OS X Install Disc and use Disk Utility to repair your startup disk..."

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This might happen if your disk needs repair, or if journaling is not turned on for the disk. Follow these steps:

  1. Start from your Mac OS X Install DVD—insert the disc and hold the C key during startup.
  2. From the Utilities menu, choose Disk Utility. Use Disk Utility to repair your Mac OS X volume.
  3. After the volume is repaired, make sure journaling is enabled for the disk. If it's not turned on (if the Enable Journaling button is not dimmed), enable it from the File menu or click the Enable Journaling button.

Tip: If Disk Utility is unable to repair the disk, back up your important files, then try using a third-party repair utility that works with Intel-based Macs. You might also try a Mac OS X 10.4.x-compatible disk defragmentation utility to consolidate free space.

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