Hi there, A few days ago, I bought my first MacBookPro mid-2010 with 1TB HDD and macOS Sierra in it. Using Disk Utility in macOS Sierra, I created another partition Format: MS-DOS FAT and successfully installed my Windows 10 Pro to that partition. When I boot my Mac and hold the Option button, I had two choices Mac OS X and EFI Boot (Window 10 Pro). Everything works fine until I created another partition using Disk Utility in macOS Sierra taken from my Mac OS X partition. After that when I boot and hold the Option button, I have only one option Mac OS X (the windows 10 options disappear). I try to fix the MBR but without luck, so I installed the windows 10 once again and everything, works fine. For that reason, I decide to backup entire HDD, including all partition's sector by sector backup using EaseUS Todo Backup. The backup takes 26 hours! After that, I felt safe, so I boot to the windows and create a partition using the partition where I have windows 10. The reason why I need extra partition is that I would like to share some common data between my macOS Sierra and windows 10. Anyhow, the system crash and I decide to recovery partition from my backup. After 17 Hours, I have my data back (sort of). I can boot to the windows 10 and use command + R when I boot, but I cannot boot to my macOS Sierra. EasyUS disk manager in windows shows me the Mac OS X as an Unknown FAT 32 partitions with the added letter D. I am able to see and copy all files and folders somewhere else. In my opinion, the issue is that I have my Mac OS X partition in FAT32 format instead of Mac OS Extended (Journaled). The questions are simple. 1, How to fix that without losing any data on that partition? 2, When I lose the data how to put the data back - files and folders that I previously copied to external HDD? 3, Is it there any other way how to do it (get my macOS Sierra back) in my situation? 4, Do you know any better, faster backup system for macOS and windows in one? 5, How to create the partition without crash my system again? Thank you for your help.