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Windows Partition Size


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What's the largest you might need a windows 10 pro or windows 11 partition to be?

(or a windows 10 partition that might be upgraded to windows 11 in a year or two)

To make it easy to restore the OS partition in case of issue, I'm planning to keep OS and data on two separate partitions. Just thinking on how much free space to leave for the windows 10 partition on the SSD so I don't regret making it too small, especially if I upgrade to windows 11 in a year.

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It’s a good idea. I purposefully keep “data” on a whole separate drive and also avoid using the Windows default “documents”, “pictures”, “music” and etc. folders (though some programs throw things in there without asking and I don’t fight them too hard).


I think 256GB for Windows+programs is adequate unless you’re going to install a lot of heavy programs. It should give breathing room for extra space needed during Windows upgrades.


There are free tools to resize partitions, so you aren’t necessarily stuck with your initial setup. I usually use GParted which is included with many Linux “Live USB” environments that you can boot.

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