I have installed a Windows only Bootcamp on my iMac (Win 8.1 in EFI-mode). And windows works well, except I have to use an external soundcard. Now, I consider a small partition of Yosemite or Mavericks on the internal SSD, ok it's the opposite way, one should normaly create a Bootcamp partition after one have Yosemite on the Mac. Reason is, I want to use Winclone or the new Paragon Beta Backup Software. Usually, I use an external Yosemite Thunderbolt SSD, and to Backup the internal Windows Bootcamp, Winclone does a Backup, but after an Recovery, I can't get Windows to boot (Error Code). Ok, I can create an Partition from within Windows, but what steps should I bear in mind to install Yosemite besides my Bootcamp? Thx!