- Aug 14, 2010
- RX 580
- Classic Mac
- Mobile Phone
The problem with preinstalled Win10 is the EFI partition - it is too small - ~90-100Mb. Mac OS wants to see 200Mb or larger to allow the installer to work correctly. This is the same with OC or Clover as the boot loader. OTOH, some Win10 preinstalled do not seem to have an EFI partition even though installed on GUID formatted drive and the Mac OS installer will create one at the end of the drive.So I'm assuming there is no way to get dual boot working from the same disk if you have a preinstalled Windows Partition while using Clover. I just made the switch to OC 5.9, although not having a simplified way to Dual boot with an existing Windows partition is upsetting. I really don't want to use a USB to boot windows. Any help would be appreciated if there is a simple way.
I do know that if you purchase the Windows 10 USB installer (Windows 10 Pro) and use it, it creates only a 90Mb EFI partition as the 2nd partition on the drive instead of the first - the first being WinRe Tools recovery partition when you choose to install Win10 Pro Workstation version. You can also choose several other versions of Win10 - take your pick.
If you are doing a new build, the matter is simple - at the selection screen to choose where to install, open an elevated command window and use diskpart to create a 200Mb or 300Mb EFI partition, exit diskpart and then select the unassigned portion of the drive to install Win10.