How large should my Boot Camp partition be if I am installing Windows 10?

I am installing Windows 10 into my BootCamp partition on my MacBook Pro.  The laptop has a 1 TB SSD so I have plenty of space, but I was wondering how big to make the BootCamp partition?
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JohnBusiness Consultant (Owner)Commented:
For a Windows 7 or Windows 10 Virtual Machine (I use VMware) I allow 100 GB for each such machine.
Jackie ManIT ManagerCommented:
The minimum size for bootcamp partition for Windows 10 64 bit is 20GB whereas the bootcamp partition for Windows 10 32 bit is 16GB. It is a requirement for hard drive space for installing Windows 10 Creator update.

"Hard drive space: 16GB for 32-bit or 20GB for 64-bit."

Your bootcamp partition size depends on your usage of Windows 10 in your Macbook Pro. If you will never use OS X and you are a Windows guy like me, you can make the bootcamp partition any size you want provided that the Apple OS X startup partition is not smaller than 55GB.

If you are essentially a Mac guy and you only use Windows 10 for MS Office applications, you can make the bootcamp partition to be 256GB which is the average internal storage size of a Windows 10 notebook in year 2017.

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JohnBusiness Consultant (Owner)Commented:
20 GB does not allow for a Repair Install if necessary, or large data file or applications. I assumed these items. My Windows 7 VM is 56 GB with only a few data files but all the applications.
Eoin OSullivanConsultantCommented:
JackieMan is correct .. your usage patterns will determine your choice.  Unlike a VMWare instance where you can create / resize and delete your instances at will when you setup Bootcamp it is a bit more restrictive and resizing partitions afterwards can be very messy and often impossible if one or the other partition is almost full.
If you expect to be booting into Windows 10 90% of the time I'd be going with 500-750Gb dedicated to Windows whereas if Windows 10 is rarely used then I'd go with 100-200Gb

Personally I'd not recommend Bootcamp for users who just need normal MSOffice and other standard business applications, you can run them on VMWare or Parallels or VirtualBox quite easily and in conjunction with OSX.  Most importantly you can resize and backup Windows easily as it is a straightforward VM.

The only reasons to choose Bootcamp over a VM is if the RAM in the MacBook is limited and not upgradeable (8Gb min for a good VM/OSX partnership and if you've less I'd recommend Bootcamp) or if you need to run certain software which is unstable under a VM.
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