Updating boot camp mac
Be sure to back it up before you go through the process.
Since you'll be using Boot Camp Assistant to basically install a new version of Windows 10, you'll grab any new drivers and such that you need as part of the installation process.
Did that without changing starting point of Bootcamp partition, otherwise windows might not boot.
You are losing the ability to boot into Mac recovery tools.
Initially introduced as an unsupported beta for Mac OS X 10.4 Tiger, the utility was first introduced with Mac OS X 10.5 Leopard and has been included in subsequent versions of the operating system ever since.
Previous versions of Boot Camp supported Windows XP, and Windows Vista.
Yosemite update created 4 partitions: one very small with some booting data, one Mac, one Mac recovery tools, and one Windows/bootcamp.
Boot Camp reformat the flash drive as a Mac bootable install disk, and combines Windows 10 with install scripts to load hardware drivers for the targeted Mac computer.
Boot Camp currently supports Windows 10 on a range of Macs dated mid-2012 or newer.
But in worst case scenario you can delete all partitions and boot from network to re-install Mac from scratch.
I couldn't find a better solution to have two Windows partitions, tried re-installing and re-partitioning around 6 times, windows would fail to boot whenever I touched the bootcamp partition.