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From: Salvador Mirzo <smirzo@example.com>
Newsgroups: alt.comp.os.windows-10,comp.os.linux.misc
Subject: shrink drive c: to install a new operating system
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Date: Tue, 24 Dec 2024 17:22:57 -0300
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Please followup-To alt.comp.os.windows-10.  (Note this is not just a
Windows question, but I believe the Windows newsgroup is more
appropriate: perhaps there are other system's shrinking tool that could
help me here.  Thanks for any ideas.)

I'm interested in installing a new operating system.  Haven't decided
which yet---perhaps FreeBSD, perhaps GNU Guix.  I've got 195 GiB free in
my c: drive plus 655 MiB unallocated which I was able to get from
shrinking the c: drive using the Windows 10 Disk Management tool.

  Disk Management (how my storage looks right now)
  https://prnt.sc/WZ1fF5S9ARJ1

Disk Management is not able to shrink more.  It says it has been done
what it could with those 655 MiB.  

  https://prnt.sc/ez9O5JUVUVXv

I turned hibernation off, restarted and tried again.  Same thing.
Looking at the defrag event in the application log, I find:

--8<-------------------------------------------------------->8---
A volume shrink analysis was initiated on volume (C:). This event log
entry details information about the last unmovable file that could limit
the maximum number of reclaimable bytes.
 
 Diagnostic details:
 - The last unmovable file appears to be: \System Volume
   Information\{fba11b84-afde-11ef-adfe-48684ad40403}{3808876b-c176-4e48-b7ae-04046e6cc752}::$DATA
 - The last cluster of the file is: 0x76e787e
 - Shrink potential target (LCN address): 0x466119b
 - The NTFS file flags are: ---AD
 - Shrink phase: <analysis>
 
 To find more details about this file please use the "fsutil volume
 querycluster \\?\Volume{f5e639db-a758-4dfa-9804-d5d4d0286fb7}
 0x76e787e" command.
--8<-------------------------------------------------------->8---

Using the fsutil command, I get:

--8<-------------------------------------------------------->8---
C:\Windows\system32>fsutil volume querycluster \\?\Volume{f5e639db-a758-4dfa-9804-d5d4d0286fb7} 0x76e787e
Cluster 0x00000000076e787e used by ---AD \System Volume
Information\{fba11b84-afde-11ef-adfe-48684ad40403}{3808876b-c176-4e48-b7ae-04046e6cc752}::$DATA
--8<-------------------------------------------------------->8---

Anything else I could try?  I have not tried to use other system's
shrinking programs.  Could they do a better job?  Perhaps this is not
the best newsgroup to ask this question.