I've a HDD in an external USB case. It has a corrupted partition/folder/file structure, i. e. it is not present in Windows XP explorer. But it is well displayed in Window's Device Manager. How can I make Recuva to find and display said HDD in its "drop-down box at left" to choose it to be scanned? How can I restrict a deep scan to some region of a storage medium, e. g., to some region of sectors (from ... to...)?