Ideal free space on C drive to install cumulative OS updates of Windows Server 2016, 2022? Particularly I am asking about the windows OS patches released on every 2nd Tuesday of the month.

Abhijit Joshi 20 Reputation points
2025-07-16T14:19:16.16+00:00

Please share Ideal free space on C drive for cumulative OS updates of Windows Server 2016, 2022? Share the link where it is mentioned the ideal free space.

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Anonymous
2025-07-29T10:48:11.4433333+00:00

Hello Abhijit Joshi

Installing Windows updates, needs extra space on your C: drive. This is because Windows makes temporary files and backups during the update.

It’s safer to keep about between 20-30 GB free space on your C: drive.

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  1. Abhijit Joshi 20 Reputation points
    2025-07-22T09:19:08.42+00:00

    Thanks for the reply. My question is specific for OS security patches (updates from Microsoft) installation and not about fresh OS installation. Microsoft releases OS security patches (Cumulative updates) on every 2nd Tuesday so my question is What is the exact free space or ideal free space on C drive required to install such patches for successful installation (I want to know the prerequisite). Thanks.

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  2. Divyesh Govaerdhanan 11,725 Reputation points MVP Volunteer Moderator
    2025-07-16T14:30:18.61+00:00

    Hello,

    Welcome to Microsoft Q&A,

    The recommended minimum disk space is 32 GB. Please have a look at the documentation below for more details.

    https://learn.microsoft.com/en-us/windows-server/get-started/hardware-requirements?tabs=storage&pivots=windows-server-2022

    Please upvote and accept the answer if it helps!!

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