I have five Sata drives. Of these five, Windows 7 Pro 64 "Computer management" reports that two of them still are 100% free despite both having significant usage as reported in "Computer" and "Explorer"
F: Simple, Basic, NTFS, Healthy, Primary partition,
"Computer management" Capacity 92.21GB Free 92.21GB
"Computer" Capacity 92.2 GB Free 16.8GB
L: Simple, Basic, NTFS, Healthy, Primary partition,
"Computer management" Capacity 389.59GB Free 389.59GB
"Computer" Capacity 389GB Free 379GB
The L: drive is newly installed and only ebook files are on it. What might have caused this and can it be corrected?