Unknown Space Taking up HDD

[ZIMDOT]

Hello! I have a 1tb HDD and I noticed that my HDD was missing some space so i looked around and found that in WinDirStat I have almost 400GB of unknown space being taken up

SCREENSHOT - http://gyazo.com/8d7179bd2121d00453c693b36b919a8b

 

[USAFRet]

Possibly a Windows.old folder?

 

[mike1996]

check in the disk management to see if it is unallocated if so you should be able to add it on

 

[ZIMDOT]

Possibly a Windows.old folder?

I just deleted it and it was not the problem!

 

[ZIMDOT]

check in the disk management to see if it is unallocated if so you should be able to add it on

No its all allocated :/

 

[ZIMDOT]

I found it out it was system restore!

 

[mike1996]

check in the disk management to see if it is unallocated if so you should be able to add it on

No its all allocated :/

-how old is your hdd,
-have you defraged it if not do so
- try ruining and antivirus or antmaliware
-and make sure that there aren't any odd programs you don't know about

- also dose windows report the same thing here's a link that might be helpful http://blog.windirstat.info/20061013/unknown-space/comment-page-1/