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Locate the Bootcamp partition and notice the partition number assigned to it. After installing this tool, bring up a Terminal window and execute: sudo gpt -r -vv show disk0 We will use this tool to derive some disk information. Head over to sourceforge and obtain the latest copy of gptfdisk: We can now begin restoration of the Bootcamp boot entry. If it is, the file explorer can be used to verify that the files within the Bootcamp partition all still exist. The Bootcamp partition should still be there. This can be verified by logging into the alternate OS (Mac OS X) and using Disk Utility to look at the partition structure. However, the partition still exists and the files within the Bootcamp partition are untouched. The problem is that when the disk structure is modified, the Bootcamp boot entry is lost from the MBR. On an unrelated note, this write up also involved resetting the Windows 7 password since I realized that I forgot the Windows password. It took a series of steps to get the Bootcamp partition boot entry back into the MBR and so I decided to document the procedure. Or, you mentioned something about Time Machine - you could also just do a full TM backup.Ģ) reboot from OS X install disk and now reformat your drive as HFS extended (journaled).ģa) if you have a TM backup, next install a fresh copy of OSX on your clean drive and then restore the rest of your apps and user data from your TM backup when the installer asks you if you want to do thatģb) OR if you don't have TM backup - instead of reinstalling the OS, just use SuperDuper to clone the external drive back to your internal hard driveĪfter (3a) or (3b) you should now have your OS X stuff back on the drive but now all free space should be contiguous.I recently installed the latest copy of Mac OS X and lost the Bootcamp Windows partition boot entry from the MBR (Master Boot Record). personally, I recommend using SuperDuper! it's trying to tell your existing OS X installation is fragmented and not enough space for a contiguous 2nd partition.ġ) first back up your entire drive to an external disk. If so, I've heard that bootcamp needs a large enough unfragmented chunk of disk space on your drive to be able to set up your Windows partition, otherwise it stops with this error.