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Windows 7: Windirstat shows 166 GB in 244 GB Drive C as unknown

01 Aug 2019   #1

windows 7 64 bit
Windirstat shows 166 GB in 244 GB Drive C as unknown

Dear All,

My desktop specs,

ACER, Intel I3 3.70 GHz, 4 GB Ram, 14 TB with 4 partitions of 244 each. In drive C, Windows 7 professional service pack is installed.

Recently i started noticing huge loss of drive space and i am left of only with 39.10 GB of space. My Windirstat shows 166 GB as unknown.

I have not installed any games and my antivirus is K7 Total security.

But i noticed a strange thing, when ever i ran disk cleanup in drive C, my hard disk free space gets reduced and when i tried with clean up system file and under the tab more options clean system restore and shadow copies, also did reduce the free space again.

Please help me with the solution. i have attached the screen shot of Windirstat.

Thanks and Regards,

V.Mahesh Kumar.

Attached Thumbnails
Windirstat shows 166 GB in 244 GB Drive C as unknown-windirstatimage.jpg  
My System SpecsSystem Spec
03 Aug 2019   #2

Windows 7 x64, Vista x64, 8.1 smartphone

Hello vmk1509

Here is how to use Disk Cleanup - Open and Use

You can also use Disk Disk Cleanup to read how much space is used up by the file type, and determine how much space will be freed.

Unknown file types are usually system files, for example, System Protection.

Have you run a Check Disk recently?
My System SpecsSystem Spec
03 Aug 2019   #3

windows 7 64 bit

Hello iko22,

Thanks for the reply.

After Disk cleanup the free space get's reduced.

Chkdsk has been run twice once while bootup and another from windows by right clicking drive c and properties, tools, check now.

The free space has not been recovered and still 166 gb in not yet released.

Thanks and Regards,

V.Mahesh Kumar.
My System SpecsSystem Spec

03 Aug 2019   #4

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64

windirstat "unknown" is not much help.

Have a look with diskgenius
All-in-one Solution for Data Recovery, Partition Manager and Data Backup - DiskGenius

glaryutilities might be more useful on second thought

Glary Disk Explorer - Search all of your local drives and individual drivers | Glarysoft
My System SpecsSystem Spec

 Windirstat shows 166 GB in 244 GB Drive C as unknown

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