This is from my thinkpad t450s which has a Samsung 240GB SSD. It has been running fine (and still is). But I suddenly noticed one morning that my D: drive had filled up overnight. This is a surprise because I hardly do anything to occupy disk space other than browsing the web, and reading pdfs.
D: drive is 110 GB in size and in MyComputer it shows that 87.9 GBs of it has been used. But when I go into the drive in windows explorer, select all files and folders and then do a file size query it shows that the total size occupied by files and folders is 24.2 GB (there's no change of this even if I select hidden folders, system folders etc). Page file is disabled on the D: drive and the only one on C: drive is system managed. I have also disabled system restore on all partitions.
Surprisingly the disk usage is only abnormal as such in D: drive only. I have checked with WinDirStat, it shows up usage as 24.2 GB. But when run with CCleaner it shows file usage of 87.9 GB and describes the ~60 GB of unexplained usage as "other files".
My question is how can I find this mysterious disk usage/bloat that Windows Explorer cant see and only CCleaner classifies as 'other files' ? Is this a sign of disk wear with some random corrupted bit sectors ? I have checked SSD health and SMART data with software and almost all of them showed no signs of errors or warnings.
Best Answer
WinDirStat is confusing and you should avoid it. Run TreeSizeFree as admin it shows the usage in depth and cleaner way compared to WinStatDir.
With this sorted TreeView you can detect the causing folder easily.