Windows 7 large folder missing on external hardisk

[adrianzy]

Yesterday i copied a large folder 51gb into my external hardisk and I used windows 7. One file name was too long and I was prompted. I selected skip file. I remember seeing the folder in my hardisk after copy. But no longer there today. the space still occupied tried using programs like pci recovery. not found.
The folder has many work files. please help;

 

[whs]

Try a live Linux CD - Link Removed - Invalid URL. Linux sometimes 'sees' things that you cannot find with Windows.