Half of my disk memory is used by "other files"

[Felkon20]

Hello! I have prety big problem with my old hard drive, today i was clearing my disc and noticed than when i deleted many unused folders etc. my disc is still used by something that CCleaner called as "Other Files". My disc is 465Gb and every folder in my disc(E:/) is just 77Gb used...
Is there any way how to remove that 250 Gb without defragmenting?
Some screenshots: http://imgur.com/a/eONsc

 

[JaredDM]

Well, I'd start by using WinDirStat to check what that data might be. Sometimes you might have a hidden temp file or something like that which is tying up a ton of space. If WinDirStat can't identify where all the extra data is, then it's probably an issue with the NTFS bitmap file (how it keeps track of what sectors are used, and unused). Sometimes the only way to fix this is to actually re-format the drive.