Amit_ Posted October 8, 2015 Share Posted October 8, 2015 The title pretty much says it all. Is it possible to do so? I currently have Windows installed on my PC on a 4 TB HDD and it has a lot of important files and programs. Is it possible for me to make a 2 TB partition and install OS X to that? Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/ Share on other sites More sharing options...
Amit_ Posted October 10, 2015 Author Share Posted October 10, 2015 bump Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2176094 Share on other sites More sharing options...
everdone Posted October 11, 2015 Share Posted October 11, 2015 It is possible to do that, but .... If Windows was installed with no thought to later installing Mac OS the drive is likely formatted as MBR not GUID. The Mac installer will not install to a MBR drive without modifying the installer (there are a number of threads indicating how to modify the installer). Other that modifying the Mac installer another approach is to install Mac OS to a different HD that is GUID and then cloning that install to a partition on the MBR Windows HD. (Mac will run from MBR drive but will not install). Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2176492 Share on other sites More sharing options...
TheEmoEmu Posted October 11, 2015 Share Posted October 11, 2015 If you are installing a legacy system then yes, with a patch to the installer. If you are trying to install onto an EFI system then no - OSX needs the EFI partition to be 200mb and the one windows creates by default is about 100mb. Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2176509 Share on other sites More sharing options...
samsunlu55 Posted October 13, 2015 Share Posted October 13, 2015 @TheEmoEmu Thats wrong. I have installed Windows 10 with full EFI. 100 MB Efi Partition. Partitioned the HDD with 2 Partition and formatted the 2. Partition with Gparted to HFS+. Installed El Capitan to the 2. Partition without Problems. Working with Clover no Probz Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2177182 Share on other sites More sharing options...
CooSee Posted October 13, 2015 Share Posted October 13, 2015 I currently have Windows installed on my PC on a 4 TB HDD and it has a lot of important files and programs. safety first i wouldn't risk it !!! there are so much - inexpensive - HDDs and SDDs available in these days. it's your choice. Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2177207 Share on other sites More sharing options...
Amit_ Posted October 15, 2015 Author Share Posted October 15, 2015 ~Bought another 320 GB 7200 rpm HDD. Link to comment https://www.insanelymac.com/forum/topic/308548-dual-boot-with-windows-installed-first/#findComment-2177860 Share on other sites More sharing options...
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