1 TB Disk Space full but files only add up to around 92 GB....What is using 900 GB???

[BuffaloSoldier]

I am having some disk space issues with my wife's Lenovo ideapad. I have a 1TB drive with 917GB allocated to the c drive. According to my c drive properties i have used 897GB and only have 19 GB free. When i add up all the space from the individual folders/files in my C drive i only get 92 GB. Im assuming i have some really large file (possibly a back up or recovery image) somewhere that i cant seem to find. I have unhidden all files and run two different storage statistical programs (WinDirStat and DiskSpace Fan 4) but both programs only found 90-95 GBs worth of files. Anybody have any ideas on what hidden file could be taking up 800GB of my c drive? Any suggestions would be appreciated.

[pcstru]

What filesystem? What is the size of the block/allocation unit? You could have an unusually large number of very small files which might say they take up a few bytes, but each one will need a whole block, regardless of how much data it takes.

[BuffaloSoldier]

NTFS and 512 bytes/sector

[fairm010]

Install this and scan the drive. will show you visually your space hogs.

 

http://www.jam-software.com/treesize_free/

[fairm010]

Run as administrator though

[pcstru]

What is the output from chkdsk. Sector size is not the same as allocation unit (cluster size).

[Arthur]

Anybody have any ideas on what hidden file could be taking up 800GB of my c drive?

Which version of Windows?

 

Is System Restore enabled and how much space is that taking up?

[elsiegee40]

It might be worth using ccleaner to see what it finds

http://www.piriform.com/ccleaner

[Arthur]

It might be worth using CCleaner to see what it finds

+1. CCEnhancer might be worth installing too since it enables CCleaner to find even more.

[Fazza]

Are you using any kind of backup software to backup the drive as it may be leaving it's temporary files or snapshots behind and not removing them?