Preamble: My drive is divided into two partitions: the System one (C) and the Data one (D), plus the other classic windows System Reserved ones (not visible from the explorer). I use Windows 10.

Lately, my System partition (C) was completely full (down to under 1 Mo of free space at some point). So to survive, Windows 10 created a new partition (drive letter E) called System Partition, I imagine to store the bare minimum to function.

Now I cleared the mess and the classical System (C) partition has enough space to function correctly (over 15 Go). However the System Partition that it created (E) is still here.

How can I get rid of it without compromising my Windows install ? I considered merging the two (C and E) but I'm afraid this will has unintended side effects. Surprisingly enough I have not been able to find any report of this behaviour on the Internet.

  • 1
    Please update your question to indicate which build of Windows 10 you are using. When you provide that information, a screenshot of your current partition layout, would be appreciated. This information is vital, and answering your question with this information provided, will result in a better answer. – Ramhound May 18 '18 at 11:48
  • You are mistaken - Windows does not create partitions on the fly when there is not enough space, it just dies ungracefully. – harrymc May 18 '18 at 13:37
  • Unfortunately the partition is no longer there so I cannot make a full diagnostic of that but what do you think created the partition ? I have seen that for previous Windows versions it doesn't create a partition (blog.superuser.com/2012/02/17/…) but for newer OS like Windows 10 I could not find anything. Do you have any source on that ? – DylanM May 19 '18 at 13:33

I had already restarted my computer multiple times but Windows still had some updates to completely roll-out. After completing all updates (April 2018 Update) and rebooting, Windows deleted the E System Partition on its own.

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