Do you know what files occupy so much Space? Have you clean the Temp folders and the Temporary internet files of yur browser? You can use the Windows search for this.
I don't have Temp folders on this particular drive (G:). The Temp files are on the system drive (C:). ATM it seems to be a virus or something.
Does "KAVITABD.DAT" mean anything to anybody? This file is only 230 Kb in size and it is on both of the strangely full drives.
EDIT: I now have 37 GB of nothing on the hard disk that I dubbed "data_drv[G:]". I am scanning this drive with Avast AND AVG, LOL. :)
Here is a sample:
G:\RECYCLER\S-1-5-21-2025429265-746137067-839522115-1003\Dd14.asf
I can't see the "RECYCLER" folder. I have set "view" to show all files hidden and system and I still can't see any folders on my data drive. :)
But as I type, both of those anti-virus programs are scanning 37 GB of files.