Triple boot OSX, Windows 8.1 and 10


i've been working on windows using bootcamp quite while , want test windows 10. i've tried find ways install second windows install couldn't find confirmation possible.

create , fat partition, reboot , install windows 10 on it?
 

on macs support uefi booting of windows (haswell , later macs), can so. because since windows installed uefi, os x no longer uses hybrid mbr partition. uses gpt entirely , hence more 4 partitions can present.

on pre-haswell macs, there os x partition , single bios-csm windows partition (windows cannot installed uefi in such macs), , since windows had installed bios-csm on such macs, os x has format drive hybrid mbr (where os x sees drive gpt , windows sees drive mbr). there 4 partitions in manner - os x takes 3 partitions (os x itself, recovery , efi, of last 2 hidden), plus windows. in way, 4 partitions present , maximum partition limit in hybrid mbr drives.
 


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