I consider to upgrade from Mountain Lion to Mavericks. I have two Bootcamp Windows 7 partitions, one for boot & system, another for documents and data. Both Windows partitions are NTFS. OS X recovery partition was manually removed prior to installing Bootcamp/Windows.
Any risk that upgrade will break either of my Windows partitions? How to minimize the risk? It definitely happened last time I upgraded from Snow Leopard (or Lion?) to Mountain Lion.
One post suggests that it happens with any OS X upgrade, though I'm not sure it applies to my situation.
Update: Tried running upgrade, got this message: "Install Failed: OS X could not be installed on your computer. OS X can't be installed on the disk because a recovery system can't be created. Visit www.apple.com/support/no-recovery to learn more" which links to another support article (which is surprisingly for Lion) suggesting to manually shrink the OS X partition which will allow space for creating recovery partition. The question is still the same: will it hurt either of my Windows NTFS partitions?
This is how my partitions look on OS X side: