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Windows 7: Need help in overcoming a problem in trying to shrink my OS (C) volume

25 Dec 2016   #1

Need help in overcoming a problem in trying to shrink my OS (C) volume

I am trying to shrink my C partition to get more space on my Data partition.

My C partition is 191 GB and shows 65GB free and I assume 126GB of used space but when I total up the size of the files on the C drive (in the show hidden files mode) I only get a total of 99GB. The math doesn't add up.

Before trying to shrink C, I defragged the partition using W7. When I then attempted to shrink the C partition by querying the volume for available shrink space it showed that I could only shrink it by only 304 MB!

Is there a way I can overcome this problem? Perhaps by using another software program.

See screen shots below

Attached Thumbnails
Need help in overcoming a problem in trying to shrink my OS (C) volume-partition-scr.png   Need help in overcoming a problem in trying to shrink my OS (C) volume-results-scr-shot.png  
My System SpecsSystem Spec
25 Dec 2016   #2

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64

I use MiniTool bootable CD to resize partitions, then Windows isn't running, more space can be shrunk on [C].
Bootable Partition Manager| MiniTool Partition Wizard Bootable Edition

I backup up everything to a different drive so i can restore/recover BEFORE making any changes.
For the OS [C] drive i use Macrium Reflect free image backups.
Macrium Reflect Free

To get a better look at space used i have WizTree, WinDirStat, and TreeSizeFree - all free and portable.
imho, WizTree is the best.
Antibody Software - WizTree finds the files and folders using the most disk space on your hard drive

Before making any changes - BACKUP, BACKUP, BACKUP

My System SpecsSystem Spec

 Need help in overcoming a problem in trying to shrink my OS (C) volume

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