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I am trying to create a new partition on my SSD and need to shrink my C: partition to do so. According to the "this PC" page, I have 36.1GB available on my C: drive. However, when I attempt to shrink my C: drive in Disk Manager I am told that there is only 9521MB available to shrink and am unable to shrink any further. I need at least 25GB for this new partition.

physBa
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    Windows requires 25GB free on C: for version updates [21H2, 22H1, etc.] and IIRC there is a way to bypass that covered on Superuser, however I personally don't recommend it. Even if your user data folders within %UserProfile% are stored on a partition other than C: shrinking C: to 25GB wouldn't be advised unless this is a VM - accounting for the pagefile.sys, hiberfil.sys, and temp files, it's taking a chance of running out of storage on C: for normal system operations. (General FYI: it's generally recommended to ensure 10% of a partition is available) – JW0914 Mar 10 '22 at 13:20
  • @JW0914 I have shrunk the volume by the allowed 9.5GB and after clearing some space I still have over 25GB, yet cannot shrink any further. – physBa Mar 10 '22 at 13:57
  • yet cannot shrink any further and you really shouldn't, reasons above. If this is to install a dual-boot then please (1) read carefully my answer to your other question, understand it, especially the risks and caveats, and (2) consider a virtual machine instead because you don't have the minimal requirements - not enough space - to install a dual-boot with Ubuntu. You'll end up with 2 OSes in serious risk of running out of space and became unbootable. – ChanganAuto Mar 10 '22 at 14:06
  • @ChanganAuto I have 50GB available. ~10GB I have left unallocated, leaving 40GB unused and stuck in my C partition, if I can make this unallocated and use it on my Ubuntu install this should be enough. 25GB is the minimal system requirement for Ubuntu. – physBa Mar 10 '22 at 14:26
  • Again, it's generally recommended to ensure 10% of a partition is available as free space. And 25GB is indeed the minimum for a basic installation and a few programs. Depending on the usage scenario you may need more, a lot more, and the same rule above applies to Ubuntu as well. – ChanganAuto Mar 10 '22 at 14:31

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