Lost Windows after repartitioning with Disk Utility I've just re-partitioned my hard-drive using Disk Utility. I shrank my Mac OS X partition and created a new one with the available space. However, after rebooting, the option to start under Windows is now gone. I only have the option to start Mac OS X.

Basically, my partitions were like this:


Mac
Windows
Data


After shrinking the Mac partition and creating a new one I get:


Mac
Fat32
Windows
Data


Does anybody know why the Windows partition was affected by this change? And how can I make it bootable again?
If you resized Mac OS partitions creating new partition after installing Boot Camp and lost Windows in boot option, you can recover it back with following steps.

If your Boot Camp is Windows 7:


Insert installation disk for Windows 7, boot to it, and start regular Windows install process.
Keep going until you see a screen saying "Install now".
Choose the option below the Install button: Repair your computer.
On following screen select first option: Startup Repair.


When done, reboot holding Option ⌥ - the Boot Camp partition is back!



If your Boot Camp is Windows XP:


Boot to OS X.
Go to your Windows XP partition.
Locate in the root directory a file called boot.ini.
Open it with a Mac text editor.
Look for part that says partition(x)
(x) represents the number of your Boot Camp partition. Now, you should add 1 to the number. Example: partition(1) should become partition(2)
Save the file and close the editor.


When done, reboot holding Option ⌥ - the Boot Camp partition is back!