In this case...you will have some issues with any type of sharing because of the two different formats.
I would recommend that you use a third party boot manager to control the boot files.

GAG is a free one that works very well.
Google and download it
Install GAG to the main harddrive and then reboot your system. It will boot to the GAG program and then look at the available icons to choose to partition the drive. Partiton the drive into as many partitions as you want. then choose to install an operating system...doesn't matter which one...install it and do all the driver files that are needed for the hardware installed for that operating system.

after you have the one completed then again boot to GAG and choose to install another different operating system. Choose the partition to install to and install that operating system as though it is the only one meaning it will need the drivers for all the hardware installed as to that operating system as well.

update and use.
Every time you boot GAG will prompt what operating sytem to use....or....it can be preset to boot to the primary one after a specific time out period.